Major restructuring of the code.

16 files changed, 0 insertions, 7543 deletions

diff --git a/src/sat/fraig/fraig.h b/src/sat/fraig/fraig.h
deleted file mode 100644
index 2b499967..00000000
--- a/src/sat/fraig/fraig.h
+++ /dev/null
@@ -1,260 +0,0 @@
-/**CFile****************************************************************
-
-  FileName    [fraig.h]
-
-  PackageName [FRAIG: Functionally reduced AND-INV graphs.]
-
-  Synopsis    [External declarations of the FRAIG package.]
-
-  Author      [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
-  
-  Affiliation [UC Berkeley]
-
-  Date        [Ver. 2.0. Started - October 1, 2004]
-
-  Revision    [$Id: fraig.h,v 1.18 2005/07/08 01:01:30 alanmi Exp $]
-
-***********************************************************************/
-
-#ifndef __FRAIG_H__
-#define __FRAIG_H__
-
-
-////////////////////////////////////////////////////////////////////////
-///                          INCLUDES                                ///
-////////////////////////////////////////////////////////////////////////
-
-////////////////////////////////////////////////////////////////////////
-///                         PARAMETERS                               ///
-////////////////////////////////////////////////////////////////////////
-
-
-
-ABC_NAMESPACE_HEADER_START
-
-
-////////////////////////////////////////////////////////////////////////
-///                    STRUCTURE DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-typedef struct Fraig_ManStruct_t_         Fraig_Man_t;
-typedef struct Fraig_NodeStruct_t_        Fraig_Node_t;
-typedef struct Fraig_NodeVecStruct_t_     Fraig_NodeVec_t;
-typedef struct Fraig_HashTableStruct_t_   Fraig_HashTable_t;
-typedef struct Fraig_ParamsStruct_t_      Fraig_Params_t;
-typedef struct Fraig_PatternsStruct_t_    Fraig_Patterns_t;
-typedef struct Prove_ParamsStruct_t_      Prove_Params_t;
-
-struct Fraig_ParamsStruct_t_
-{
-    int  nPatsRand;     // the number of words of random simulation info
-    int  nPatsDyna;     // the number of words of dynamic simulation info
-    int  nBTLimit;      // the max number of backtracks to perform
-    int  nSeconds;      // the timeout for the final proof
-    int  fFuncRed;      // performs only one level hashing
-    int  fFeedBack;     // enables solver feedback
-    int  fDist1Pats;    // enables distance-1 patterns
-    int  fDoSparse;     // performs equiv tests for sparse functions 
-    int  fChoicing;     // enables recording structural choices
-    int  fTryProve;     // tries to solve the final miter
-    int  fVerbose;      // the verbosiness flag
-    int  fVerboseP;     // the verbosiness flag (for proof reporting)
-    int  fInternal;     // is set to 1 for internal fraig calls
-    int  nConfLimit;    // the limit on the number of conflicts
-    ABC_INT64_T nInspLimit;  // the limit on the number of inspections
-};
-
-struct Prove_ParamsStruct_t_
-{
-    // general parameters
-    int     fUseFraiging;          // enables fraiging
-    int     fUseRewriting;         // enables rewriting
-    int     fUseBdds;              // enables BDD construction when other methods fail
-    int     fVerbose;              // prints verbose stats
-    // iterations
-    int     nItersMax;             // the number of iterations
-    // mitering 
-    int     nMiteringLimitStart;   // starting mitering limit
-    float   nMiteringLimitMulti;   // multiplicative coefficient to increase the limit in each iteration
-    // rewriting 
-    int     nRewritingLimitStart;  // the number of rewriting iterations
-    float   nRewritingLimitMulti;  // multiplicative coefficient to increase the limit in each iteration
-    // fraiging 
-    int     nFraigingLimitStart;   // starting backtrack(conflict) limit
-    float   nFraigingLimitMulti;   // multiplicative coefficient to increase the limit in each iteration
-    // last-gasp BDD construction
-    int     nBddSizeLimit;         // the number of BDD nodes when construction is aborted
-    int     fBddReorder;           // enables dynamic BDD variable reordering
-    // last-gasp mitering
-    int     nMiteringLimitLast;    // final mitering limit
-    // global SAT solver limits
-    ABC_INT64_T  nTotalBacktrackLimit;  // global limit on the number of backtracks
-    ABC_INT64_T  nTotalInspectLimit;    // global limit on the number of clause inspects
-    // global resources applied
-    ABC_INT64_T  nTotalBacktracksMade;  // the total number of backtracks made
-    ABC_INT64_T  nTotalInspectsMade;    // the total number of inspects made
-};
-
-////////////////////////////////////////////////////////////////////////
-///                       GLOBAL VARIABLES                           ///
-////////////////////////////////////////////////////////////////////////
-
-////////////////////////////////////////////////////////////////////////
-///                       MACRO DEFINITIONS                          ///
-////////////////////////////////////////////////////////////////////////
- 
-// macros working with complemented attributes of the nodes
-#define Fraig_IsComplement(p)    (((int)((ABC_PTRUINT_T) (p) & 01)))
-#define Fraig_Regular(p)         ((Fraig_Node_t *)((ABC_PTRUINT_T)(p) & ~01)) 
-#define Fraig_Not(p)             ((Fraig_Node_t *)((ABC_PTRUINT_T)(p) ^ 01)) 
-#define Fraig_NotCond(p,c)       ((Fraig_Node_t *)((ABC_PTRUINT_T)(p) ^ (c)))
-
-// these are currently not used
-#define Fraig_Ref(p)              
-#define Fraig_Deref(p)            
-#define Fraig_RecursiveDeref(p,c)
-
-////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-/*=== fraigApi.c =============================================================*/
-extern Fraig_NodeVec_t *   Fraig_ManReadVecInputs( Fraig_Man_t * p );
-extern Fraig_NodeVec_t *   Fraig_ManReadVecOutputs( Fraig_Man_t * p );    
-extern Fraig_NodeVec_t *   Fraig_ManReadVecNodes( Fraig_Man_t * p );      
-extern Fraig_Node_t **     Fraig_ManReadInputs ( Fraig_Man_t * p );       
-extern Fraig_Node_t **     Fraig_ManReadOutputs( Fraig_Man_t * p );       
-extern Fraig_Node_t **     Fraig_ManReadNodes( Fraig_Man_t * p );         
-extern int                 Fraig_ManReadInputNum ( Fraig_Man_t * p );     
-extern int                 Fraig_ManReadOutputNum( Fraig_Man_t * p );     
-extern int                 Fraig_ManReadNodeNum( Fraig_Man_t * p );       
-extern Fraig_Node_t *      Fraig_ManReadConst1 ( Fraig_Man_t * p );       
-extern Fraig_Node_t *      Fraig_ManReadIthVar( Fraig_Man_t * p, int i ); 
-extern Fraig_Node_t *      Fraig_ManReadIthNode( Fraig_Man_t * p, int i );
-extern char **             Fraig_ManReadInputNames( Fraig_Man_t * p );    
-extern char **             Fraig_ManReadOutputNames( Fraig_Man_t * p );   
-extern char *              Fraig_ManReadVarsInt( Fraig_Man_t * p );       
-extern char *              Fraig_ManReadSat( Fraig_Man_t * p );           
-extern int                 Fraig_ManReadFuncRed( Fraig_Man_t * p );       
-extern int                 Fraig_ManReadFeedBack( Fraig_Man_t * p );      
-extern int                 Fraig_ManReadDoSparse( Fraig_Man_t * p );      
-extern int                 Fraig_ManReadChoicing( Fraig_Man_t * p );      
-extern int                 Fraig_ManReadVerbose( Fraig_Man_t * p );       
-extern int *               Fraig_ManReadModel( Fraig_Man_t * p );
-extern int                 Fraig_ManReadPatternNumRandom( Fraig_Man_t * p );
-extern int                 Fraig_ManReadPatternNumDynamic( Fraig_Man_t * p );
-extern int                 Fraig_ManReadPatternNumDynamicFiltered( Fraig_Man_t * p );
-extern int                 Fraig_ManReadSatFails( Fraig_Man_t * p );      
-extern int                 Fraig_ManReadConflicts( Fraig_Man_t * p );      
-extern int                 Fraig_ManReadInspects( Fraig_Man_t * p );      
-
-extern void                Fraig_ManSetFuncRed( Fraig_Man_t * p, int fFuncRed );        
-extern void                Fraig_ManSetFeedBack( Fraig_Man_t * p, int fFeedBack );      
-extern void                Fraig_ManSetDoSparse( Fraig_Man_t * p, int fDoSparse );      
-extern void                Fraig_ManSetChoicing( Fraig_Man_t * p, int fChoicing ); 
-extern void                Fraig_ManSetTryProve( Fraig_Man_t * p, int fTryProve );
-extern void                Fraig_ManSetVerbose( Fraig_Man_t * p, int fVerbose );        
-extern void                Fraig_ManSetTimeToGraph( Fraig_Man_t * p, int Time );        
-extern void                Fraig_ManSetTimeToNet( Fraig_Man_t * p, int Time );          
-extern void                Fraig_ManSetTimeTotal( Fraig_Man_t * p, int Time );          
-extern void                Fraig_ManSetOutputNames( Fraig_Man_t * p, char ** ppNames ); 
-extern void                Fraig_ManSetInputNames( Fraig_Man_t * p, char ** ppNames );  
-extern void                Fraig_ManSetPo( Fraig_Man_t * p, Fraig_Node_t * pNode );
-
-extern Fraig_Node_t *      Fraig_NodeReadData0( Fraig_Node_t * p );                     
-extern Fraig_Node_t *      Fraig_NodeReadData1( Fraig_Node_t * p );                     
-extern int                 Fraig_NodeReadNum( Fraig_Node_t * p );                       
-extern Fraig_Node_t *      Fraig_NodeReadOne( Fraig_Node_t * p );                       
-extern Fraig_Node_t *      Fraig_NodeReadTwo( Fraig_Node_t * p );                       
-extern Fraig_Node_t *      Fraig_NodeReadNextE( Fraig_Node_t * p );                     
-extern Fraig_Node_t *      Fraig_NodeReadRepr( Fraig_Node_t * p );                      
-extern int                 Fraig_NodeReadNumRefs( Fraig_Node_t * p );                   
-extern int                 Fraig_NodeReadNumFanouts( Fraig_Node_t * p );                
-extern int                 Fraig_NodeReadSimInv( Fraig_Node_t * p );                    
-extern int                 Fraig_NodeReadNumOnes( Fraig_Node_t * p );
-extern unsigned *          Fraig_NodeReadPatternsRandom( Fraig_Node_t * p );
-extern unsigned *          Fraig_NodeReadPatternsDynamic( Fraig_Node_t * p );
-
-extern void                Fraig_NodeSetData0( Fraig_Node_t * p, Fraig_Node_t * pData );
-extern void                Fraig_NodeSetData1( Fraig_Node_t * p, Fraig_Node_t * pData );
-
-extern int                 Fraig_NodeIsConst( Fraig_Node_t * p );
-extern int                 Fraig_NodeIsVar( Fraig_Node_t * p );
-extern int                 Fraig_NodeIsAnd( Fraig_Node_t * p );
-extern int                 Fraig_NodeComparePhase( Fraig_Node_t * p1, Fraig_Node_t * p2 );
-
-extern Fraig_Node_t *      Fraig_NodeOr( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 );
-extern Fraig_Node_t *      Fraig_NodeAnd( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 );
-extern Fraig_Node_t *      Fraig_NodeOr( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 );
-extern Fraig_Node_t *      Fraig_NodeExor( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 );
-extern Fraig_Node_t *      Fraig_NodeMux( Fraig_Man_t * p, Fraig_Node_t * pNode, Fraig_Node_t * pNodeT, Fraig_Node_t * pNodeE );
-extern void                Fraig_NodeSetChoice( Fraig_Man_t * pMan, Fraig_Node_t * pNodeOld, Fraig_Node_t * pNodeNew );
-
-/*=== fraigMan.c =============================================================*/
-extern void                Prove_ParamsSetDefault( Prove_Params_t * pParams );
-extern void                Fraig_ParamsSetDefault( Fraig_Params_t * pParams );
-extern void                Fraig_ParamsSetDefaultFull( Fraig_Params_t * pParams );
-extern Fraig_Man_t *       Fraig_ManCreate( Fraig_Params_t * pParams );
-extern void                Fraig_ManFree( Fraig_Man_t * pMan );
-extern void                Fraig_ManPrintStats( Fraig_Man_t * p );
-extern Fraig_NodeVec_t *   Fraig_ManGetSimInfo( Fraig_Man_t * p );
-extern int                 Fraig_ManCheckClauseUsingSimInfo( Fraig_Man_t * p, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2 );
-extern void                Fraig_ManAddClause( Fraig_Man_t * p, Fraig_Node_t ** ppNodes, int nNodes );
-
-/*=== fraigDfs.c =============================================================*/
-extern Fraig_NodeVec_t *   Fraig_Dfs( Fraig_Man_t * pMan, int fEquiv );
-extern Fraig_NodeVec_t *   Fraig_DfsOne( Fraig_Man_t * pMan, Fraig_Node_t * pNode, int fEquiv );
-extern Fraig_NodeVec_t *   Fraig_DfsNodes( Fraig_Man_t * pMan, Fraig_Node_t ** ppNodes, int nNodes, int fEquiv );
-extern Fraig_NodeVec_t *   Fraig_DfsReverse( Fraig_Man_t * pMan );
-extern int                 Fraig_CountNodes( Fraig_Man_t * pMan, int fEquiv );
-extern int                 Fraig_CheckTfi( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew );
-extern int                 Fraig_CountLevels( Fraig_Man_t * pMan );
-
-/*=== fraigSat.c =============================================================*/
-extern int                 Fraig_NodesAreEqual( Fraig_Man_t * p, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int nBTLimit, int nTimeLimit );
-extern int                 Fraig_NodeIsEquivalent( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew, int nBTLimit, int nTimeLimit );
-extern void                Fraig_ManProveMiter( Fraig_Man_t * p );
-extern int                 Fraig_ManCheckMiter( Fraig_Man_t * p );
-extern int                 Fraig_ManCheckClauseUsingSat( Fraig_Man_t * p, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int nBTLimit );
-
-/*=== fraigVec.c ===============================================================*/
-extern Fraig_NodeVec_t *   Fraig_NodeVecAlloc( int nCap );
-extern void                Fraig_NodeVecFree( Fraig_NodeVec_t * p );
-extern Fraig_NodeVec_t *   Fraig_NodeVecDup( Fraig_NodeVec_t * p );
-extern Fraig_Node_t **     Fraig_NodeVecReadArray( Fraig_NodeVec_t * p );
-extern int                 Fraig_NodeVecReadSize( Fraig_NodeVec_t * p );
-extern void                Fraig_NodeVecGrow( Fraig_NodeVec_t * p, int nCapMin );
-extern void                Fraig_NodeVecShrink( Fraig_NodeVec_t * p, int nSizeNew );
-extern void                Fraig_NodeVecClear( Fraig_NodeVec_t * p );
-extern void                Fraig_NodeVecPush( Fraig_NodeVec_t * p, Fraig_Node_t * Entry );
-extern int                 Fraig_NodeVecPushUnique( Fraig_NodeVec_t * p, Fraig_Node_t * Entry );
-extern void                Fraig_NodeVecPushOrder( Fraig_NodeVec_t * p, Fraig_Node_t * pNode );
-extern int                 Fraig_NodeVecPushUniqueOrder( Fraig_NodeVec_t * p, Fraig_Node_t * pNode );
-extern void                Fraig_NodeVecPushOrderByLevel( Fraig_NodeVec_t * p, Fraig_Node_t * pNode );
-extern int                 Fraig_NodeVecPushUniqueOrderByLevel( Fraig_NodeVec_t * p, Fraig_Node_t * pNode );
-extern Fraig_Node_t *      Fraig_NodeVecPop( Fraig_NodeVec_t * p );
-extern void                Fraig_NodeVecRemove( Fraig_NodeVec_t * p, Fraig_Node_t * Entry );
-extern void                Fraig_NodeVecWriteEntry( Fraig_NodeVec_t * p, int i, Fraig_Node_t * Entry );
-extern Fraig_Node_t *      Fraig_NodeVecReadEntry( Fraig_NodeVec_t * p, int i );
-extern void                Fraig_NodeVecSortByLevel( Fraig_NodeVec_t * p, int fIncreasing );
-extern void                Fraig_NodeVecSortByNumber( Fraig_NodeVec_t * p );
-
-/*=== fraigUtil.c ===============================================================*/
-extern void                Fraig_ManMarkRealFanouts( Fraig_Man_t * p );
-extern int                 Fraig_ManCheckConsistency( Fraig_Man_t * p );
-extern int                 Fraig_GetMaxLevel( Fraig_Man_t * pMan );
-extern void                Fraig_ManReportChoices( Fraig_Man_t * pMan );
-extern void                Fraig_MappingSetChoiceLevels( Fraig_Man_t * pMan, int fMaximum );
-extern Fraig_NodeVec_t *   Fraig_CollectSupergate( Fraig_Node_t * pNode, int fStopAtMux );
-
-////////////////////////////////////////////////////////////////////////
-///                       END OF FILE                                ///
-////////////////////////////////////////////////////////////////////////
- 
-
-
-ABC_NAMESPACE_HEADER_END
-
-
-
-#endif
diff --git a/src/sat/fraig/fraigApi.c b/src/sat/fraig/fraigApi.c
deleted file mode 100644
index 6e0ab959..00000000
--- a/src/sat/fraig/fraigApi.c
+++ /dev/null
@@ -1,302 +0,0 @@
-/**CFile****************************************************************
-
-  FileName    [fraigApi.c]
-
-  PackageName [FRAIG: Functionally reduced AND-INV graphs.]
-
-  Synopsis    [Access APIs for the FRAIG manager and node.]
-
-  Author      [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
-  
-  Affiliation [UC Berkeley]
-
-  Date        [Ver. 2.0. Started - October 1, 2004]
-
-  Revision    [$Id: fraigApi.c,v 1.2 2005/07/08 01:01:30 alanmi Exp $]
-
-***********************************************************************/
-
-#include "fraigInt.h"
-
-ABC_NAMESPACE_IMPL_START
-
-
-////////////////////////////////////////////////////////////////////////
-///                        DECLARATIONS                              ///
-////////////////////////////////////////////////////////////////////////
-
-////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-/**Function*************************************************************
-
-  Synopsis    [Access functions to read the data members of the manager.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_NodeVec_t * Fraig_ManReadVecInputs( Fraig_Man_t * p )                   { return p->vInputs;            }
-Fraig_NodeVec_t * Fraig_ManReadVecOutputs( Fraig_Man_t * p )                  { return p->vOutputs;           }
-Fraig_NodeVec_t * Fraig_ManReadVecNodes( Fraig_Man_t * p )                    { return p->vNodes;             }
-Fraig_Node_t **   Fraig_ManReadInputs ( Fraig_Man_t * p )                     { return p->vInputs->pArray;    }
-Fraig_Node_t **   Fraig_ManReadOutputs( Fraig_Man_t * p )                     { return p->vOutputs->pArray;   }
-Fraig_Node_t **   Fraig_ManReadNodes( Fraig_Man_t * p )                       { return p->vNodes->pArray;     }
-int               Fraig_ManReadInputNum ( Fraig_Man_t * p )                   { return p->vInputs->nSize;     }
-int               Fraig_ManReadOutputNum( Fraig_Man_t * p )                   { return p->vOutputs->nSize;    }
-int               Fraig_ManReadNodeNum( Fraig_Man_t * p )                     { return p->vNodes->nSize;      }
-Fraig_Node_t *    Fraig_ManReadConst1 ( Fraig_Man_t * p )                     { return p->pConst1;            }
-Fraig_Node_t *    Fraig_ManReadIthNode( Fraig_Man_t * p, int i )              { assert ( i < p->vNodes->nSize  ); return p->vNodes->pArray[i];  }
-char **           Fraig_ManReadInputNames( Fraig_Man_t * p )                  { return p->ppInputNames;       }
-char **           Fraig_ManReadOutputNames( Fraig_Man_t * p )                 { return p->ppOutputNames;      }
-char *            Fraig_ManReadVarsInt( Fraig_Man_t * p )                     { return (char *)p->vVarsInt;   }
-char *            Fraig_ManReadSat( Fraig_Man_t * p )                         { return (char *)p->pSat;       }
-int               Fraig_ManReadFuncRed( Fraig_Man_t * p )                     { return p->fFuncRed;   }
-int               Fraig_ManReadFeedBack( Fraig_Man_t * p )                    { return p->fFeedBack;  }
-int               Fraig_ManReadDoSparse( Fraig_Man_t * p )                    { return p->fDoSparse;  }
-int               Fraig_ManReadChoicing( Fraig_Man_t * p )                    { return p->fChoicing;  }
-int               Fraig_ManReadVerbose( Fraig_Man_t * p )                     { return p->fVerbose;   }
-int *             Fraig_ManReadModel( Fraig_Man_t * p )                       { return p->pModel;     }
-// returns the number of patterns used for random simulation (this number is fixed for the FRAIG run)
-int               Fraig_ManReadPatternNumRandom( Fraig_Man_t * p )            { return p->nWordsRand * 32;  }
-// returns the number of dynamic patterns accumulated at runtime (include SAT solver counter-examples and distance-1 patterns derived from them)
-int               Fraig_ManReadPatternNumDynamic( Fraig_Man_t * p )           { return p->iWordStart * 32;  }
-// returns the number of dynamic patterns proved useful to distinquish some FRAIG nodes (this number is more than 0 after the first garbage collection of patterns)
-int               Fraig_ManReadPatternNumDynamicFiltered( Fraig_Man_t * p )   { return p->iPatsPerm;        }
-// returns the number of times FRAIG package timed out
-int               Fraig_ManReadSatFails( Fraig_Man_t * p )                    { return p->nSatFailsReal;    }      
-// returns the number of conflicts in the SAT solver
-int               Fraig_ManReadConflicts( Fraig_Man_t * p )                   { return p->pSat? Msat_SolverReadBackTracks(p->pSat) : 0; }      
-// returns the number of inspections in the SAT solver
-int               Fraig_ManReadInspects( Fraig_Man_t * p )                    { return p->pSat? Msat_SolverReadInspects(p->pSat) : 0;   }            
-
-/**Function*************************************************************
-
-  Synopsis    [Access functions to set the data members of the manager.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void            Fraig_ManSetFuncRed( Fraig_Man_t * p, int fFuncRed )        { p->fFuncRed  = fFuncRed;  }
-void            Fraig_ManSetFeedBack( Fraig_Man_t * p, int fFeedBack )      { p->fFeedBack = fFeedBack; }
-void            Fraig_ManSetDoSparse( Fraig_Man_t * p, int fDoSparse )      { p->fDoSparse = fDoSparse; }
-void            Fraig_ManSetChoicing( Fraig_Man_t * p, int fChoicing )      { p->fChoicing = fChoicing; }
-void            Fraig_ManSetTryProve( Fraig_Man_t * p, int fTryProve )      { p->fTryProve = fTryProve; }
-void            Fraig_ManSetVerbose( Fraig_Man_t * p, int fVerbose )        { p->fVerbose  = fVerbose;  }
-void            Fraig_ManSetTimeToGraph( Fraig_Man_t * p, int Time )        { p->timeToAig = Time;      }
-void            Fraig_ManSetTimeToNet( Fraig_Man_t * p, int Time )          { p->timeToNet = Time;      }
-void            Fraig_ManSetTimeTotal( Fraig_Man_t * p, int Time )          { p->timeTotal = Time;      }
-void            Fraig_ManSetOutputNames( Fraig_Man_t * p, char ** ppNames ) { p->ppOutputNames = ppNames; }
-void            Fraig_ManSetInputNames( Fraig_Man_t * p, char ** ppNames )  { p->ppInputNames  = ppNames; }
-
-/**Function*************************************************************
-
-  Synopsis    [Access functions to read the data members of the node.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Node_t *  Fraig_NodeReadData0( Fraig_Node_t * p )                   { return p->pData0;    }
-Fraig_Node_t *  Fraig_NodeReadData1( Fraig_Node_t * p )                   { return p->pData1;    }
-int             Fraig_NodeReadNum( Fraig_Node_t * p )                     { return p->Num;       }
-Fraig_Node_t *  Fraig_NodeReadOne( Fraig_Node_t * p )                     { assert (!Fraig_IsComplement(p)); return p->p1; }
-Fraig_Node_t *  Fraig_NodeReadTwo( Fraig_Node_t * p )                     { assert (!Fraig_IsComplement(p)); return p->p2; }
-Fraig_Node_t *  Fraig_NodeReadNextE( Fraig_Node_t * p )                   { return p->pNextE;    }
-Fraig_Node_t *  Fraig_NodeReadRepr( Fraig_Node_t * p )                    { return p->pRepr;     }
-int             Fraig_NodeReadNumRefs( Fraig_Node_t * p )                 { return p->nRefs;     }
-int             Fraig_NodeReadNumFanouts( Fraig_Node_t * p )              { return p->nFanouts;  }
-int             Fraig_NodeReadSimInv( Fraig_Node_t * p )                  { return p->fInv;      }
-int             Fraig_NodeReadNumOnes( Fraig_Node_t * p )                 { return p->nOnes;     }
-// returns the pointer to the random simulation patterns (their number is returned by Fraig_ManReadPatternNumRandom)
-// memory pointed to by this and the following procedure is maintained by the FRAIG package and exists as long as the package runs
-unsigned *      Fraig_NodeReadPatternsRandom( Fraig_Node_t * p )          { return p->puSimR;    }
-// returns the pointer to the dynamic simulation patterns (their number is returned by Fraig_ManReadPatternNumDynamic or Fraig_ManReadPatternNumDynamicFiltered)
-// if the number of patterns is not evenly divisible by 32, the patterns beyond the given number contain garbage
-unsigned *      Fraig_NodeReadPatternsDynamic( Fraig_Node_t * p )         { return p->puSimD;    }
-
-/**Function*************************************************************
-
-  Synopsis    [Access functions to set the data members of the node.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void            Fraig_NodeSetData0( Fraig_Node_t * p, Fraig_Node_t * pData )      { p->pData0  = pData;  }
-void            Fraig_NodeSetData1( Fraig_Node_t * p, Fraig_Node_t * pData )      { p->pData1  = pData;  }
-
-/**Function*************************************************************
-
-  Synopsis    [Checks the type of the node.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int             Fraig_NodeIsConst( Fraig_Node_t * p )    {  return (Fraig_Regular(p))->Num   == 0;  }
-int             Fraig_NodeIsVar( Fraig_Node_t * p )      {  return (Fraig_Regular(p))->NumPi >= 0;  }
-int             Fraig_NodeIsAnd( Fraig_Node_t * p )      {  return (Fraig_Regular(p))->NumPi <  0 && (Fraig_Regular(p))->Num > 0;  }
-int             Fraig_NodeComparePhase( Fraig_Node_t * p1, Fraig_Node_t * p2 ) { assert( !Fraig_IsComplement(p1) ); assert( !Fraig_IsComplement(p2) ); return p1->fInv ^ p2->fInv; }
-
-/**Function*************************************************************
-
-  Synopsis    [Returns a new primary input node.]
-
-  Description [If the node with this number does not exist, 
-  create a new PI node with this number.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_ManReadIthVar( Fraig_Man_t * p, int i )
-{
-    int k;
-    if ( i < 0 )
-    {
-        printf( "Requesting a PI with a negative number\n" );
-        return NULL;
-    }
-    // create the PIs to fill in the interval
-    if ( i >= p->vInputs->nSize )
-        for ( k = p->vInputs->nSize; k <= i; k++ )
-            Fraig_NodeCreatePi( p ); 
-    return p->vInputs->pArray[i];
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Creates a new PO node.]
-
-  Description [This procedure may take a complemented node.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_ManSetPo( Fraig_Man_t * p, Fraig_Node_t * pNode )
-{
-    // internal node may be a PO two times
-    Fraig_Regular(pNode)->fNodePo = 1;
-    Fraig_NodeVecPush( p->vOutputs, pNode );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Perfoms the AND operation with functional hashing.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_NodeAnd( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 )
-{
-    return Fraig_NodeAndCanon( p, p1, p2 );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Perfoms the OR operation with functional hashing.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_NodeOr( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 )
-{
-    return Fraig_Not( Fraig_NodeAndCanon( p, Fraig_Not(p1), Fraig_Not(p2) ) );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Perfoms the EXOR operation with functional hashing.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_NodeExor( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 )
-{
-    return Fraig_NodeMux( p, p1, Fraig_Not(p2), p2 );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Perfoms the MUX operation with functional hashing.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_NodeMux( Fraig_Man_t * p, Fraig_Node_t * pC, Fraig_Node_t * pT, Fraig_Node_t * pE )
-{
-    Fraig_Node_t * pAnd1, * pAnd2, * pRes;
-    pAnd1 = Fraig_NodeAndCanon( p, pC,          pT );     Fraig_Ref( pAnd1 );
-    pAnd2 = Fraig_NodeAndCanon( p, Fraig_Not(pC), pE );   Fraig_Ref( pAnd2 );
-    pRes  = Fraig_NodeOr( p, pAnd1, pAnd2 ); 
-    Fraig_RecursiveDeref( p, pAnd1 );
-    Fraig_RecursiveDeref( p, pAnd2 );
-    Fraig_Deref( pRes );
-    return pRes;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Sets the node to be equivalent to the given one.]
-
-  Description [This procedure is a work-around for the equivalence check.
-  Does not verify the equivalence. Use at the user's risk.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeSetChoice( Fraig_Man_t * pMan, Fraig_Node_t * pNodeOld, Fraig_Node_t * pNodeNew )
-{
-//    assert( pMan->fChoicing );
-    pNodeNew->pNextE = pNodeOld->pNextE;
-    pNodeOld->pNextE = pNodeNew;
-    pNodeNew->pRepr  = pNodeOld;
-}
-
-////////////////////////////////////////////////////////////////////////
-///                       END OF FILE                                ///
-////////////////////////////////////////////////////////////////////////
-
-
-ABC_NAMESPACE_IMPL_END
-
diff --git a/src/sat/fraig/fraigCanon.c b/src/sat/fraig/fraigCanon.c
deleted file mode 100644
index 47539db2..00000000
--- a/src/sat/fraig/fraigCanon.c
+++ /dev/null
@@ -1,223 +0,0 @@
-/**CFile****************************************************************
-
-  FileName    [fraigCanon.c]
-
-  PackageName [FRAIG: Functionally reduced AND-INV graphs.]
-
-  Synopsis    [AND-node creation and elementary AND-operation.]
-
-  Author      [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
-  
-  Affiliation [UC Berkeley]
-
-  Date        [Ver. 2.0. Started - October 1, 2004]
-
-  Revision    [$Id: fraigCanon.c,v 1.4 2005/07/08 01:01:31 alanmi Exp $]
-
-***********************************************************************/
-
-#include <limits.h>
-#include "fraigInt.h"
-
-ABC_NAMESPACE_IMPL_START
-
-
-////////////////////////////////////////////////////////////////////////
-///                        DECLARATIONS                              ///
-////////////////////////////////////////////////////////////////////////
-
-////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-/**Function*************************************************************
-
-  Synopsis    [The internal AND operation for the two FRAIG nodes.]
-
-  Description [This procedure is the core of the FRAIG package, because
-  it performs the two-step canonicization of FRAIG nodes. The first step
-  involves the lookup in the structural hash table (which hashes two ANDs 
-  into a node that has them as fanins, if such a node exists). If the node 
-  is not found in the structural hash table, an attempt is made to find a 
-  functionally equivalent node in another hash table (which hashes the 
-  simulation info into the nodes, which has this simulation info). Some 
-  tricks used on the way are described in the comments to the code and
-  in the paper "FRAIGs: Functionally reduced AND-INV graphs".]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_NodeAndCanon( Fraig_Man_t * pMan, Fraig_Node_t * p1, Fraig_Node_t * p2 )
-{
-    Fraig_Node_t * pNodeNew, * pNodeOld, * pNodeRepr;
-    int fUseSatCheck;
-//    int RetValue;
-
-    // check for trivial cases
-    if ( p1 == p2 )
-        return p1;
-    if ( p1 == Fraig_Not(p2) )
-        return Fraig_Not(pMan->pConst1);
-    if ( Fraig_NodeIsConst(p1) )
-    {
-        if ( p1 == pMan->pConst1 )
-            return p2;
-        return Fraig_Not(pMan->pConst1);
-    }
-    if ( Fraig_NodeIsConst(p2) )
-    {
-        if ( p2 == pMan->pConst1 )
-            return p1;
-        return Fraig_Not(pMan->pConst1);
-    }
-/*
-    // check for less trivial cases
-    if ( Fraig_IsComplement(p1) )
-    {
-        if ( RetValue = Fraig_NodeIsInSupergate( Fraig_Regular(p1), p2 ) )
-        {
-            if ( RetValue == -1 )
-                pMan->nImplies0++;
-            else
-                pMan->nImplies1++;
-
-            if ( RetValue == -1 )
-                return p2;
-        }
-    }
-    else
-    {
-        if ( RetValue = Fraig_NodeIsInSupergate( p1, p2 ) )
-        {
-            if ( RetValue == 1 )
-                pMan->nSimplifies1++;
-            else
-                pMan->nSimplifies0++;
-
-            if ( RetValue == 1 )
-                return p1;
-            return Fraig_Not(pMan->pConst1);
-        }
-    }
- 
-    if ( Fraig_IsComplement(p2) )
-    {
-        if ( RetValue = Fraig_NodeIsInSupergate( Fraig_Regular(p2), p1 ) )
-        {
-            if ( RetValue == -1 )
-                pMan->nImplies0++;
-            else
-                pMan->nImplies1++;
-
-            if ( RetValue == -1 )
-                return p1;
-        }
-    }
-    else
-    {
-        if ( RetValue = Fraig_NodeIsInSupergate( p2, p1 ) )
-        {
-            if ( RetValue == 1 )
-                pMan->nSimplifies1++;
-            else
-                pMan->nSimplifies0++;
-
-            if ( RetValue == 1 )
-                return p2;
-            return Fraig_Not(pMan->pConst1);
-        }
-    }
-*/
-    // perform level-one structural hashing
-    if ( Fraig_HashTableLookupS( pMan, p1, p2, &pNodeNew ) ) // the node with these children is found
-    {
-        // if the existent node is part of the cone of unused logic
-        // (that is logic feeding the node which is equivalent to the given node)
-        // return the canonical representative of this node
-        // determine the phase of the given node, with respect to its canonical form
-        pNodeRepr = Fraig_Regular(pNodeNew)->pRepr;
-        if ( pMan->fFuncRed && pNodeRepr )
-            return Fraig_NotCond( pNodeRepr, Fraig_IsComplement(pNodeNew) ^ Fraig_NodeComparePhase(Fraig_Regular(pNodeNew), pNodeRepr) );
-        // otherwise, the node is itself a canonical representative, return it
-        return pNodeNew;
-    }
-    // the same node is not found, but the new one is created
-
-    // if one level hashing is requested (without functionality hashing), return
-    if ( !pMan->fFuncRed )
-        return pNodeNew;
-
-    // check if the new node is unique using the simulation info
-    if ( pNodeNew->nOnes == 0 || pNodeNew->nOnes == (unsigned)pMan->nWordsRand * 32 )
-    {
-        pMan->nSatZeros++;
-        if ( !pMan->fDoSparse ) // if we do not do sparse functions, skip
-            return pNodeNew;
-        // check the sparse function simulation hash table
-        pNodeOld = Fraig_HashTableLookupF0( pMan, pNodeNew );
-        if ( pNodeOld == NULL ) // the node is unique (it is added to the table)
-            return pNodeNew;
-    }
-    else
-    {
-        // check the simulation hash table
-        pNodeOld = Fraig_HashTableLookupF( pMan, pNodeNew );
-        if ( pNodeOld == NULL ) // the node is unique
-            return pNodeNew;
-    }
-    assert( pNodeOld->pRepr == 0 );
-    // there is another node which looks the same according to simulation
-
-    // use SAT to resolve the ambiguity
-    fUseSatCheck = (pMan->nInspLimit == 0 || Fraig_ManReadInspects(pMan) < pMan->nInspLimit); 
-    if ( fUseSatCheck && Fraig_NodeIsEquivalent( pMan, pNodeOld, pNodeNew, pMan->nBTLimit, 1000000 ) )
-    {
-        // set the node to be equivalent with this node
-        // to prevent loops, only set if the old node is not in the TFI of the new node
-        // the loop may happen in the following case: suppose 
-        // NodeC = AND(NodeA, NodeB) and at the same time NodeA => NodeB
-        // in this case, NodeA and NodeC are functionally equivalent
-        // however, NodeA is a fanin of node NodeC (this leads to the loop)
-        // add the node to the list of equivalent nodes or dereference it
-        if ( pMan->fChoicing && !Fraig_CheckTfi( pMan, pNodeOld, pNodeNew ) )
-        { 
-            // if the old node is not in the TFI of the new node and choicing 
-            // is enabled, add the new node to the list of equivalent ones
-            pNodeNew->pNextE = pNodeOld->pNextE;
-            pNodeOld->pNextE = pNodeNew;
-        }
-        // set the canonical representative of this node
-        pNodeNew->pRepr = pNodeOld;
-        // return the equivalent node
-        return Fraig_NotCond( pNodeOld, Fraig_NodeComparePhase(pNodeOld, pNodeNew) );
-    }
-
-    // now we add another member to this simulation class
-    if ( pNodeNew->nOnes == 0 || pNodeNew->nOnes == (unsigned)pMan->nWordsRand * 32 )
-    {
-        Fraig_Node_t * pNodeTemp;
-        assert( pMan->fDoSparse );
-        pNodeTemp = Fraig_HashTableLookupF0( pMan, pNodeNew );
-//        assert( pNodeTemp == NULL );
-//        Fraig_HashTableInsertF0( pMan, pNodeNew );
-    }
-    else
-    {
-        pNodeNew->pNextD = pNodeOld->pNextD;
-        pNodeOld->pNextD = pNodeNew;
-    }
-    // return the new node
-    assert( pNodeNew->pRepr == 0 );
-    return pNodeNew;
-}
-
-
-////////////////////////////////////////////////////////////////////////
-///                       END OF FILE                                ///
-////////////////////////////////////////////////////////////////////////
-
-
-ABC_NAMESPACE_IMPL_END
-
diff --git a/src/sat/fraig/fraigChoice.c b/src/sat/fraig/fraigChoice.c
deleted file mode 100644
index 21d4fe10..00000000
--- a/src/sat/fraig/fraigChoice.c
+++ /dev/null
@@ -1,246 +0,0 @@
-/**CFile****************************************************************
-
-  FileName    [fraigTrans.c]
-
-  PackageName [MVSIS 1.3: Multi-valued logic synthesis system.]
-
-  Synopsis    [Adds the additive and distributive choices to the AIG.]
-
-  Author      [MVSIS Group]
-  
-  Affiliation [UC Berkeley]
-
-  Date        [Ver. 1.0. Started - February 1, 2003.]
-
-  Revision    [$Id: fraigTrans.c,v 1.1 2005/02/28 05:34:34 alanmi Exp $]
-
-***********************************************************************/
-
-#include "fraigInt.h"
-
-ABC_NAMESPACE_IMPL_START
-
-
-////////////////////////////////////////////////////////////////////////
-///                        DECLARATIONS                              ///
-////////////////////////////////////////////////////////////////////////
-
-////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFITIONS                           ///
-////////////////////////////////////////////////////////////////////////
-
-/**Function*************************************************************
-
-  Synopsis    [Adds choice nodes based on associativity.]
-
-  Description [Make nLimit big AND gates and add all decompositions
-               to the Fraig.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_ManAddChoices( Fraig_Man_t * pMan, int fVerbose, int nLimit )
-{
-//    ProgressBar * pProgress;
-    char Buffer[100];
-    int clkTotal = clock();
-    int i, nNodesBefore, nNodesAfter, nInputs, nMaxNodes;
-    int /*nMaxLevel,*/ nDistributive;
-    Fraig_Node_t *pNode, *pRepr;
-    Fraig_Node_t *pX, *pA, *pB, *pC, /* *pD,*/ *pN, /* *pQ, *pR,*/ *pT;
-    int fShortCut = 0;
-
-    nDistributive = 0;
-
-//    Fraig_ManSetApprox( pMan, 1 );
-
-    // NO functional reduction
-    if (fShortCut) Fraig_ManSetFuncRed( pMan, 0 );
-
-    // First we mark critical functions i.e. compute those
-    // nodes which lie on the critical path. Note that this
-    // doesn't update the required times on any choice nodes
-    // which are not the representatives
-/*
-    nMaxLevel = Fraig_GetMaxLevel( pMan );
-    for ( i = 0; i < pMan->nOutputs; i++ )
-    {
-        Fraig_SetNodeRequired( pMan, pMan->pOutputs[i], nMaxLevel );
-    }
-*/
-    nNodesBefore = Fraig_ManReadNodeNum( pMan );
-    nInputs      = Fraig_ManReadInputNum( pMan );
-    nMaxNodes    = nInputs + nLimit * ( nNodesBefore - nInputs );
-
-    printf ("Limit = %d, Before = %d\n", nMaxNodes, nNodesBefore );
-
-    if (0) 
-    {
-        char buffer[128];
-        sprintf (buffer, "test" );
-//        Fraig_MappingShow( pMan, buffer );
-    }
-
-//    pProgress = Extra_ProgressBarStart( stdout, nMaxNodes );
-Fraig_ManCheckConsistency( pMan );
-
-    for ( i = nInputs+1; (i < Fraig_ManReadNodeNum( pMan )) 
-            && (nMaxNodes > Fraig_ManReadNodeNum( pMan )); ++i )
-    {
-//        if ( i == nNodesBefore )
-//            break;
-
-        pNode = Fraig_ManReadIthNode( pMan, i );
-        assert ( pNode );
-
-        pRepr = pNode->pRepr ? pNode->pRepr : pNode;
-        //printf ("Slack: %d\n", Fraig_NodeReadSlack( pRepr ));
-        
-        // All the new associative choices we add will have huge slack
-        // since we do not redo timing, and timing doesnt handle choices
-        // well anyway. However every newly added node is a choice of an
-        // existing critical node, so they are considered critical.
-//        if ( (Fraig_NodeReadSlack( pRepr ) > 3) && (i < nNodesBefore)  )     
-//            continue;
-
-//        if ( pNode->pRepr )
-//            continue;
-
-        // Try ((ab)c), x = ab -> (a(bc)) and (b(ac))
-        pX = Fraig_NodeReadOne(pNode);
-        pC = Fraig_NodeReadTwo(pNode);
-        if (Fraig_NodeIsAnd(pX) && !Fraig_IsComplement(pX))
-        {
-            pA = Fraig_NodeReadOne(Fraig_Regular(pX));
-            pB = Fraig_NodeReadTwo(Fraig_Regular(pX));
-
-//            pA = Fraig_NodeGetRepr( pA );
-//            pB = Fraig_NodeGetRepr( pB );
-//            pC = Fraig_NodeGetRepr( pC );
-
-            if (fShortCut) 
-            {
-                pT = Fraig_NodeAnd(pMan, pB, pC);
-                if ( !pT->pRepr )
-                {
-                    pN = Fraig_NodeAnd(pMan, pA, pT);
-//                    Fraig_NodeAddChoice( pMan, pNode, pN );
-                }
-            }
-            else
-                pN = Fraig_NodeAnd(pMan, pA, Fraig_NodeAnd(pMan, pB, pC));
-            // assert ( Fraig_NodesEqual(pN, pNode) );
-
-
-            if (fShortCut) 
-            {
-                pT = Fraig_NodeAnd(pMan, pA, pC);
-                if ( !pT->pRepr )
-                {
-                    pN = Fraig_NodeAnd(pMan, pB, pT);
-//                    Fraig_NodeAddChoice( pMan, pNode, pN );
-                }
-            }
-            else
-                pN = Fraig_NodeAnd(pMan, pB, Fraig_NodeAnd(pMan, pA, pC));
-            // assert ( Fraig_NodesEqual(pN, pNode) );
-        }
-
-
-        // Try (a(bc)), x = bc -> ((ab)c) and ((ac)b)
-        pA = Fraig_NodeReadOne(pNode);
-        pX = Fraig_NodeReadTwo(pNode);
-        if (Fraig_NodeIsAnd(pX) && !Fraig_IsComplement(pX))
-        {
-            pB = Fraig_NodeReadOne(Fraig_Regular(pX));
-            pC = Fraig_NodeReadTwo(Fraig_Regular(pX));
-
-//            pA = Fraig_NodeGetRepr( pA );
-//            pB = Fraig_NodeGetRepr( pB );
-//            pC = Fraig_NodeGetRepr( pC );
-
-            if (fShortCut) 
-            {
-                pT = Fraig_NodeAnd(pMan, pA, pB);
-                if ( !pT->pRepr )
-                {
-                    pN = Fraig_NodeAnd(pMan, pC, pT);
-//                    Fraig_NodeAddChoice( pMan, pNode, pN );
-                }
-            }
-            else
-                pN = Fraig_NodeAnd(pMan, Fraig_NodeAnd(pMan, pA, pB), pC);
-            // assert ( Fraig_NodesEqual(pN, pNode) );
-
-            if (fShortCut) 
-            {
-                pT = Fraig_NodeAnd(pMan, pA, pC);
-                if ( !pT->pRepr )
-                {
-                    pN = Fraig_NodeAnd(pMan, pB, pT);
-//                    Fraig_NodeAddChoice( pMan, pNode, pN );
-                }
-            }
-            else
-                pN = Fraig_NodeAnd(pMan, Fraig_NodeAnd(pMan, pA, pC), pB);
-            // assert ( Fraig_NodesEqual(pN, pNode) );
-        }
-
-
-/*
-        // Try distributive transform
-        pQ = Fraig_NodeReadOne(pNode);
-        pR = Fraig_NodeReadTwo(pNode);
-        if ( (Fraig_IsComplement(pQ) && Fraig_NodeIsAnd(pQ))
-             && (Fraig_IsComplement(pR) && Fraig_NodeIsAnd(pR)) )
-        {
-            pA = Fraig_NodeReadOne(Fraig_Regular(pQ));
-            pB = Fraig_NodeReadTwo(Fraig_Regular(pQ));
-            pC = Fraig_NodeReadOne(Fraig_Regular(pR));
-            pD = Fraig_NodeReadTwo(Fraig_Regular(pR));
-
-            // Now detect the !(xy + xz) pattern, store 
-            // x in pA, y in pB and z in pC and set pD = 0 to indicate
-            // pattern was found
-            assert (pD != 0);
-            if (pA == pC) { pC = pD;                   pD = 0; } 
-            if (pA == pD) {                            pD = 0; } 
-            if (pB == pC) { pB = pA; pA = pC; pC = pD; pD = 0; }
-            if (pB == pD) { pB = pA; pA = pD;          pD = 0; }
-            if (pD == 0)
-            {
-                nDistributive++;
-                pN = Fraig_Not(Fraig_NodeAnd(pMan, pA, 
-                        Fraig_NodeOr(pMan, pB, pC)));
-                if (fShortCut) Fraig_NodeAddChoice( pMan, pNode, pN );
-                // assert ( Fraig_NodesEqual(pN, pNode) );
-            }
-        }
-*/            
-        if ( i % 1000 == 0 )
-        {
-            sprintf( Buffer, "Adding choice %6d...", i - nNodesBefore );
-//            Extra_ProgressBarUpdate( pProgress, i, Buffer );
-        }
-    }
-
-//    Extra_ProgressBarStop( pProgress );
-
-Fraig_ManCheckConsistency( pMan );
-
-    nNodesAfter = Fraig_ManReadNodeNum( pMan );
-    printf ( "Nodes before = %6d. Nodes with associative choices = %6d. Increase = %4.2f %%.\n", 
-            nNodesBefore, nNodesAfter, ((float)(nNodesAfter - nNodesBefore)) * 100.0/(nNodesBefore - nInputs) );
-    printf ( "Distributive = %d\n", nDistributive );
-
-}
-
-////////////////////////////////////////////////////////////////////////
-///                       END OF FILE                                ///
-////////////////////////////////////////////////////////////////////////
-
-
-ABC_NAMESPACE_IMPL_END
-
diff --git a/src/sat/fraig/fraigFanout.c b/src/sat/fraig/fraigFanout.c
deleted file mode 100644
index 0e6c86f8..00000000
--- a/src/sat/fraig/fraigFanout.c
+++ /dev/null
@@ -1,180 +0,0 @@
-/**CFile****************************************************************
-
-  FileName    [fraigFanout.c]
-
-  PackageName [FRAIG: Functionally reduced AND-INV graphs.]
-
-  Synopsis    [Procedures to manipulate fanouts of the FRAIG nodes.]
-
-  Author      [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
-  
-  Affiliation [UC Berkeley]
-
-  Date        [Ver. 2.0. Started - October 1, 2004]
-
-  Revision    [$Id: fraigFanout.c,v 1.5 2005/07/08 01:01:31 alanmi Exp $]
-
-***********************************************************************/
-
-#include "fraigInt.h"
-
-ABC_NAMESPACE_IMPL_START
-
-
-#ifdef FRAIG_ENABLE_FANOUTS
-
-////////////////////////////////////////////////////////////////////////
-///                        DECLARATIONS                              ///
-////////////////////////////////////////////////////////////////////////
-
-////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-/**Function*************************************************************
-
-  Synopsis    [Add the fanout to the node.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeAddFaninFanout( Fraig_Node_t * pFanin, Fraig_Node_t * pFanout )
-{
-    Fraig_Node_t * pPivot;
-
-    // pFanins is a fanin of pFanout
-    assert( !Fraig_IsComplement(pFanin) );
-    assert( !Fraig_IsComplement(pFanout) );
-    assert( Fraig_Regular(pFanout->p1) == pFanin || Fraig_Regular(pFanout->p2) == pFanin );
-
-    pPivot = pFanin->pFanPivot;
-    if ( pPivot == NULL )
-    {
-        pFanin->pFanPivot = pFanout;
-        return;
-    }
-
-    if ( Fraig_Regular(pPivot->p1) == pFanin )
-    {
-        if ( Fraig_Regular(pFanout->p1) == pFanin )
-        {
-            pFanout->pFanFanin1 = pPivot->pFanFanin1;
-            pPivot->pFanFanin1  = pFanout;
-        }
-        else // if ( Fraig_Regular(pFanout->p2) == pFanin )
-        {
-            pFanout->pFanFanin2 = pPivot->pFanFanin1;
-            pPivot->pFanFanin1  = pFanout;
-        }
-    }
-    else // if ( Fraig_Regular(pPivot->p2) == pFanin )
-    {
-        assert( Fraig_Regular(pPivot->p2) == pFanin );
-        if ( Fraig_Regular(pFanout->p1) == pFanin )
-        {
-            pFanout->pFanFanin1 = pPivot->pFanFanin2;
-            pPivot->pFanFanin2  = pFanout;
-        }
-        else // if ( Fraig_Regular(pFanout->p2) == pFanin )
-        {
-            pFanout->pFanFanin2 = pPivot->pFanFanin2;
-            pPivot->pFanFanin2  = pFanout;
-        }
-    }
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Add the fanout to the node.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeRemoveFaninFanout( Fraig_Node_t * pFanin, Fraig_Node_t * pFanoutToRemove )
-{
-    Fraig_Node_t * pFanout, * pFanout2, ** ppFanList;
-    // start the linked list of fanouts
-    ppFanList = &pFanin->pFanPivot; 
-    // go through the fanouts
-    Fraig_NodeForEachFanoutSafe( pFanin, pFanout, pFanout2 )
-    {
-        // skip the fanout-to-remove
-        if ( pFanout == pFanoutToRemove )
-            continue;
-        // add useful fanouts to the list
-        *ppFanList = pFanout;
-        ppFanList = Fraig_NodeReadNextFanoutPlace( pFanin, pFanout );
-    }
-    *ppFanList = NULL;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Transfers fanout to a different node.]
-
-  Description [Assumes that the other node currently has no fanouts.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeTransferFanout( Fraig_Node_t * pNodeFrom, Fraig_Node_t * pNodeTo )
-{
-    Fraig_Node_t * pFanout;
-    assert( pNodeTo->pFanPivot == NULL );
-    assert( pNodeTo->pFanFanin1 == NULL );
-    assert( pNodeTo->pFanFanin2 == NULL );
-    // go through the fanouts and update their fanins
-    Fraig_NodeForEachFanout( pNodeFrom, pFanout )
-    {
-        if ( Fraig_Regular(pFanout->p1) == pNodeFrom )
-            pFanout->p1 = Fraig_NotCond( pNodeTo, Fraig_IsComplement(pFanout->p1) );
-        else if ( Fraig_Regular(pFanout->p2) == pNodeFrom )
-            pFanout->p2 = Fraig_NotCond( pNodeTo, Fraig_IsComplement(pFanout->p2) );            
-    }
-    // move the pointers
-    pNodeTo->pFanPivot  = pNodeFrom->pFanPivot;  
-    pNodeTo->pFanFanin1 = pNodeFrom->pFanFanin1; 
-    pNodeTo->pFanFanin2 = pNodeFrom->pFanFanin2;
-    pNodeFrom->pFanPivot  = NULL; 
-    pNodeFrom->pFanFanin1 = NULL; 
-    pNodeFrom->pFanFanin2 = NULL;  
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns the number of fanouts of a node.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeGetFanoutNum( Fraig_Node_t * pNode )
-{
-    Fraig_Node_t * pFanout;
-    int Counter = 0;
-    Fraig_NodeForEachFanout( pNode, pFanout )
-        Counter++;
-    return Counter;
-}
-
-////////////////////////////////////////////////////////////////////////
-///                       END OF FILE                                ///
-////////////////////////////////////////////////////////////////////////
-
-#endif
-
-ABC_NAMESPACE_IMPL_END
-
diff --git a/src/sat/fraig/fraigFeed.c b/src/sat/fraig/fraigFeed.c
deleted file mode 100644
index 47f946e1..00000000
--- a/src/sat/fraig/fraigFeed.c
+++ /dev/null
@@ -1,913 +0,0 @@
-/**CFile****************************************************************
-
-  FileName    [fraigFeed.c]
-
-  PackageName [FRAIG: Functionally reduced AND-INV graphs.]
-
-  Synopsis    [Procedures to support the solver feedback.]
-
-  Author      [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
-  
-  Affiliation [UC Berkeley]
-
-  Date        [Ver. 2.0. Started - October 1, 2004]
-
-  Revision    [$Id: fraigFeed.c,v 1.8 2005/07/08 01:01:31 alanmi Exp $]
-
-***********************************************************************/
-
-#include "fraigInt.h"
-
-ABC_NAMESPACE_IMPL_START
-
-
-////////////////////////////////////////////////////////////////////////
-///                        DECLARATIONS                              ///
-////////////////////////////////////////////////////////////////////////
-
-static int   Fraig_FeedBackPrepare( Fraig_Man_t * p, int * pModel, Msat_IntVec_t * vVars );
-static int   Fraig_FeedBackInsert( Fraig_Man_t * p, int nVarsPi );
-static void  Fraig_FeedBackVerify( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew );
-
-static void  Fraig_FeedBackCovering( Fraig_Man_t * p, Msat_IntVec_t * vPats );
-static       Fraig_NodeVec_t * Fraig_FeedBackCoveringStart( Fraig_Man_t * pMan );
-static int   Fraig_GetSmallestColumn( int * pHits, int nHits );
-static int   Fraig_GetHittingPattern( unsigned * pSims, int nWords );
-static void  Fraig_CancelCoveredColumns( Fraig_NodeVec_t * vColumns, int * pHits, int iPat );
-static void  Fraig_FeedBackCheckTable( Fraig_Man_t * p );
-static void  Fraig_FeedBackCheckTableF0( Fraig_Man_t * p );
-static void  Fraig_ReallocateSimulationInfo( Fraig_Man_t * p );
-
-
-////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-/**Function*************************************************************
-
-  Synopsis    [Initializes the feedback information.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_FeedBackInit( Fraig_Man_t * p )
-{
-    p->vCones    = Fraig_NodeVecAlloc( 500 );
-    p->vPatsReal = Msat_IntVecAlloc( 1000 ); 
-    p->pSimsReal = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims );
-    memset( p->pSimsReal, 0, sizeof(unsigned) * p->nWordsDyna );
-    p->pSimsTemp = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims );
-    p->pSimsDiff = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Processes the feedback from teh solver.]
-
-  Description [Array pModel gives the value of each variable in the SAT 
-  solver. Array vVars is the array of integer numbers of variables
-  involves in this conflict.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_FeedBack( Fraig_Man_t * p, int * pModel, Msat_IntVec_t * vVars, Fraig_Node_t * pOld, Fraig_Node_t * pNew )
-{
-    int nVarsPi, nWords;
-    int i, clk = clock();
-
-    // get the number of PI vars in the feedback (also sets the PI values)
-    nVarsPi = Fraig_FeedBackPrepare( p, pModel, vVars );
-
-    // set the PI values
-    nWords = Fraig_FeedBackInsert( p, nVarsPi );
-    assert( p->iWordStart + nWords <= p->nWordsDyna );
-
-    // resimulates the words from p->iWordStart to iWordStop
-    for ( i = 1; i < p->vNodes->nSize; i++ )
-        if ( Fraig_NodeIsAnd(p->vNodes->pArray[i]) )
-            Fraig_NodeSimulate( p->vNodes->pArray[i], p->iWordStart, p->iWordStart + nWords, 0 );
-
-    if ( p->fDoSparse )
-        Fraig_TableRehashF0( p, 0 );
-
-    if ( !p->fChoicing )
-    Fraig_FeedBackVerify( p, pOld, pNew );
-
-    // if there is no room left, compress the patterns
-    if ( p->iWordStart + nWords == p->nWordsDyna )
-        p->iWordStart = Fraig_FeedBackCompress( p );
-    else  // otherwise, update the starting word
-        p->iWordStart += nWords;
-
-p->timeFeed += clock() - clk;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Get the number and values of the PI variables.]
-
-  Description [Returns the number of PI variables involved in this feedback.
-  Fills in the internal presence and value data for the primary inputs.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_FeedBackPrepare( Fraig_Man_t * p, int * pModel, Msat_IntVec_t * vVars )
-{
-    Fraig_Node_t * pNode;
-    int i, nVars, nVarsPis, * pVars;
-
-    // clean the presence flag for all PIs
-    for ( i = 0; i < p->vInputs->nSize; i++ )
-    {
-        pNode = p->vInputs->pArray[i];
-        pNode->fFeedUse = 0;
-    }
-
-    // get the variables involved in the feedback
-    nVars = Msat_IntVecReadSize(vVars);
-    pVars = Msat_IntVecReadArray(vVars);
-
-    // set the values for the present variables
-    nVarsPis = 0;
-    for ( i = 0; i < nVars; i++ )
-    {
-        pNode = p->vNodes->pArray[ pVars[i] ];
-        if ( !Fraig_NodeIsVar(pNode) )
-            continue;
-        // set its value
-        pNode->fFeedUse = 1;
-        pNode->fFeedVal = !MSAT_LITSIGN(pModel[pVars[i]]);
-        nVarsPis++;
-    }
-    return nVarsPis;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Inserts the new simulation patterns.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_FeedBackInsert( Fraig_Man_t * p, int nVarsPi )
-{
-    Fraig_Node_t * pNode;
-    int nWords, iPatFlip, nPatFlipLimit, i, w;
-    int fUseNoPats = 0;
-    int fUse2Pats = 0;
-
-    // get the number of words 
-    if ( fUse2Pats )
-        nWords = FRAIG_NUM_WORDS( 2 * nVarsPi + 1 );
-    else if ( fUseNoPats )
-        nWords = 1;
-    else
-        nWords = FRAIG_NUM_WORDS( nVarsPi + 1 );
-    // update the number of words if they do not fit into the simulation info
-    if ( nWords > p->nWordsDyna - p->iWordStart )
-        nWords = p->nWordsDyna - p->iWordStart; 
-    // determine the bound on the flipping bit
-    nPatFlipLimit = nWords * 32 - 2;
-
-    // mark the real pattern
-    Msat_IntVecPush( p->vPatsReal, p->iWordStart * 32 ); 
-    // record the real pattern
-    Fraig_BitStringSetBit( p->pSimsReal, p->iWordStart * 32 );
-
-    // set the values at the PIs
-    iPatFlip = 1;
-    for ( i = 0; i < p->vInputs->nSize; i++ )
-    {
-        pNode = p->vInputs->pArray[i];
-        for ( w = p->iWordStart; w < p->iWordStart + nWords; w++ )
-            if ( !pNode->fFeedUse )
-                pNode->puSimD[w] = FRAIG_RANDOM_UNSIGNED;
-            else if ( pNode->fFeedVal )
-                pNode->puSimD[w] = FRAIG_FULL;
-            else // if ( !pNode->fFeedVal )
-                pNode->puSimD[w] = 0;
-
-        if ( fUse2Pats )
-        {
-            // flip two patterns
-            if ( pNode->fFeedUse && 2 * iPatFlip < nPatFlipLimit )
-            {
-                Fraig_BitStringXorBit( pNode->puSimD + p->iWordStart, 2 * iPatFlip - 1 );
-                Fraig_BitStringXorBit( pNode->puSimD + p->iWordStart, 2 * iPatFlip     );
-                Fraig_BitStringXorBit( pNode->puSimD + p->iWordStart, 2 * iPatFlip + 1 );
-                iPatFlip++;
-            }
-        }
-        else if ( fUseNoPats )
-        {
-        }
-        else
-        {
-            // flip the diagonal
-            if ( pNode->fFeedUse && iPatFlip < nPatFlipLimit )
-            {
-                Fraig_BitStringXorBit( pNode->puSimD + p->iWordStart, iPatFlip );
-                iPatFlip++;
-    //            Extra_PrintBinary( stdout, &pNode->puSimD, 45 ); printf( "\n" );
-            }
-        }
-        // clean the use mask
-        pNode->fFeedUse = 0;
-
-        // add the info to the D hash value of the PIs
-        for ( w = p->iWordStart; w < p->iWordStart + nWords; w++ )
-            pNode->uHashD ^= pNode->puSimD[w] * s_FraigPrimes[w];
-
-    }
-    return nWords;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Checks that the SAT solver pattern indeed distinquishes the nodes.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_FeedBackVerify( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew )
-{
-    int fValue1, fValue2, iPat;
-    iPat   = Msat_IntVecReadEntry( p->vPatsReal, Msat_IntVecReadSize(p->vPatsReal)-1 );
-    fValue1 = (Fraig_BitStringHasBit( pOld->puSimD, iPat ));
-    fValue2 = (Fraig_BitStringHasBit( pNew->puSimD, iPat ));
-/*
-Fraig_PrintNode( p, pOld );
-printf( "\n" );
-Fraig_PrintNode( p, pNew );
-printf( "\n" );
-*/
-//    assert( fValue1 != fValue2 );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Compress the simulation patterns.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_FeedBackCompress( Fraig_Man_t * p )
-{
-    unsigned * pSims;
-    unsigned uHash;
-    int i, w, t, nPats, * pPats;
-    int fPerformChecks = (p->nBTLimit == -1);
-
-    // solve the covering problem
-    if ( fPerformChecks )
-    {
-        Fraig_FeedBackCheckTable( p );
-        if ( p->fDoSparse ) 
-            Fraig_FeedBackCheckTableF0( p );
-    }
-
-    // solve the covering problem
-    Fraig_FeedBackCovering( p, p->vPatsReal );
-
-
-    // get the number of additional patterns
-    nPats = Msat_IntVecReadSize( p->vPatsReal );
-    pPats = Msat_IntVecReadArray( p->vPatsReal );
-    // get the new starting word
-    p->iWordStart = FRAIG_NUM_WORDS( p->iPatsPerm + nPats );
-
-    // set the simulation info for the PIs
-    for ( i = 0; i < p->vInputs->nSize; i++ )
-    {
-        // get hold of the simulation info for this PI
-        pSims = p->vInputs->pArray[i]->puSimD;
-        // clean the storage for the new patterns
-        for ( w = p->iWordPerm; w < p->iWordStart; w++ )
-            p->pSimsTemp[w] = 0;
-        // set the patterns
-        for ( t = 0; t < nPats; t++ )
-            if ( Fraig_BitStringHasBit( pSims, pPats[t] ) )
-            {
-                // check if this pattern falls into temporary storage
-                if ( p->iPatsPerm + t < p->iWordPerm * 32 )
-                    Fraig_BitStringSetBit( pSims, p->iPatsPerm + t );
-                else
-                    Fraig_BitStringSetBit( p->pSimsTemp, p->iPatsPerm + t );
-            }
-        // copy the pattern 
-        for ( w = p->iWordPerm; w < p->iWordStart; w++ )
-            pSims[w] = p->pSimsTemp[w];
-        // recompute the hashing info
-        uHash = 0;
-        for ( w = 0; w < p->iWordStart; w++ )
-            uHash ^= pSims[w] * s_FraigPrimes[w];
-        p->vInputs->pArray[i]->uHashD = uHash;
-    }
-
-    // update info about the permanently stored patterns
-    p->iWordPerm = p->iWordStart;
-    p->iPatsPerm += nPats;
-    assert( p->iWordPerm == FRAIG_NUM_WORDS( p->iPatsPerm ) );
-
-    // resimulate and recompute the hash values
-    for ( i = 1; i < p->vNodes->nSize; i++ )
-        if ( Fraig_NodeIsAnd(p->vNodes->pArray[i]) )
-        {
-            p->vNodes->pArray[i]->uHashD = 0;
-            Fraig_NodeSimulate( p->vNodes->pArray[i], 0, p->iWordPerm, 0 );
-        }
-
-    // double-check that the nodes are still distinguished
-    if ( fPerformChecks )
-        Fraig_FeedBackCheckTable( p );
-
-    // rehash the values in the F0 table
-    if ( p->fDoSparse ) 
-    {
-        Fraig_TableRehashF0( p, 0 );
-        if ( fPerformChecks )
-            Fraig_FeedBackCheckTableF0( p );
-    }
-
-    // check if we need to resize the simulation info
-    // if less than FRAIG_WORDS_STORE words are left, reallocate simulation info
-    if ( p->iWordPerm + FRAIG_WORDS_STORE > p->nWordsDyna )
-        Fraig_ReallocateSimulationInfo( p );
-
-    // set the real patterns
-    Msat_IntVecClear( p->vPatsReal );
-    memset( p->pSimsReal, 0, sizeof(unsigned)*p->nWordsDyna );
-    for ( w = 0; w < p->iWordPerm; w++ )
-        p->pSimsReal[w] = FRAIG_FULL;
-    if ( p->iPatsPerm % 32 > 0 )
-        p->pSimsReal[p->iWordPerm-1] = FRAIG_MASK( p->iPatsPerm % 32 );
-//    printf( "The number of permanent words = %d.\n", p->iWordPerm );
-    return p->iWordStart;
-}
-
-
-
-
-/**Function*************************************************************
-
-  Synopsis    [Checks the correctness of the functional simulation table.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_FeedBackCovering( Fraig_Man_t * p, Msat_IntVec_t * vPats )
-{
-    Fraig_NodeVec_t * vColumns;
-    unsigned * pSims;
-    int * pHits, iPat, iCol, i;
-    int nOnesTotal, nSolStarting;
-    int fVeryVerbose = 0;
-
-    // collect the pairs to be distinguished
-    vColumns = Fraig_FeedBackCoveringStart( p );
-    // collect the number of 1s in each simulation vector
-    nOnesTotal = 0;
-    pHits = ABC_ALLOC( int, vColumns->nSize );
-    for ( i = 0; i < vColumns->nSize; i++ )
-    {
-        pSims = (unsigned *)vColumns->pArray[i];
-        pHits[i] = Fraig_BitStringCountOnes( pSims, p->iWordStart );
-        nOnesTotal += pHits[i];
-//        assert( pHits[i] > 0 );
-    }
- 
-    // go through the patterns
-    nSolStarting = Msat_IntVecReadSize(vPats);
-    while ( (iCol = Fraig_GetSmallestColumn( pHits, vColumns->nSize )) != -1 )
-    {
-        // find the pattern, which hits this column
-        iPat = Fraig_GetHittingPattern( (unsigned *)vColumns->pArray[iCol], p->iWordStart );
-        // cancel the columns covered by this pattern
-        Fraig_CancelCoveredColumns( vColumns, pHits, iPat );
-        // save the pattern
-        Msat_IntVecPush( vPats, iPat );
-    }
-
-    // free the set of columns
-    for ( i = 0; i < vColumns->nSize; i++ )
-        Fraig_MemFixedEntryRecycle( p->mmSims, (char *)vColumns->pArray[i] );
-
-    // print stats related to the covering problem
-    if ( p->fVerbose && fVeryVerbose )
-    {
-        printf( "%3d\\%3d\\%3d   ",     p->nWordsRand, p->nWordsDyna, p->iWordPerm );
-        printf( "Col (pairs) = %5d.  ", vColumns->nSize );
-        printf( "Row (pats) = %5d.  ",  p->iWordStart * 32 );
-        printf( "Dns = %6.2f %%.  ",    vColumns->nSize==0? 0.0 : 100.0 * nOnesTotal / vColumns->nSize / p->iWordStart / 32 );
-        printf( "Sol = %3d (%3d).  ",   Msat_IntVecReadSize(vPats), nSolStarting );
-        printf( "\n" );
-    }
-    Fraig_NodeVecFree( vColumns );
-    ABC_FREE( pHits );
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Checks the correctness of the functional simulation table.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_NodeVec_t * Fraig_FeedBackCoveringStart( Fraig_Man_t * p )
-{
-    Fraig_NodeVec_t * vColumns;
-    Fraig_HashTable_t * pT = p->pTableF;
-    Fraig_Node_t * pEntF, * pEntD;
-    unsigned * pSims;
-    unsigned * pUnsigned1, * pUnsigned2;
-    int i, k, m, w;//, nOnes;
-
-    // start the set of columns
-    vColumns = Fraig_NodeVecAlloc( 100 );
-
-    // go through the pairs of nodes to be distinguished
-    for ( i = 0; i < pT->nBins; i++ )
-    Fraig_TableBinForEachEntryF( pT->pBins[i], pEntF )
-    {
-        p->vCones->nSize = 0;
-        Fraig_TableBinForEachEntryD( pEntF, pEntD )
-            Fraig_NodeVecPush( p->vCones, pEntD );
-        if ( p->vCones->nSize == 1 )
-            continue;
-        //////////////////////////////// bug fix by alanmi, September 14, 2006
-        if ( p->vCones->nSize > 20 ) 
-            continue;
-        ////////////////////////////////
-
-        for ( k = 0; k < p->vCones->nSize; k++ )
-            for ( m = k+1; m < p->vCones->nSize; m++ )
-            {
-                if ( !Fraig_CompareSimInfoUnderMask( p->vCones->pArray[k], p->vCones->pArray[m], p->iWordStart, 0, p->pSimsReal ) )
-                    continue;
-
-                // primary simulation patterns (counter-examples) cannot distinguish this pair
-                // get memory to store the feasible simulation patterns
-                pSims = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims );
-                // find the pattern that distinguish this column, exept the primary ones
-                pUnsigned1 = p->vCones->pArray[k]->puSimD;
-                pUnsigned2 = p->vCones->pArray[m]->puSimD;
-                for ( w = 0; w < p->iWordStart; w++ )
-                    pSims[w] = (pUnsigned1[w] ^ pUnsigned2[w]) & ~p->pSimsReal[w];
-                // store the pattern
-                Fraig_NodeVecPush( vColumns, (Fraig_Node_t *)pSims );
-//                nOnes = Fraig_BitStringCountOnes(pSims, p->iWordStart);
-//                assert( nOnes > 0 );
-            }      
-    }
-
-    // if the flag is not set, do not consider sparse nodes in p->pTableF0
-    if ( !p->fDoSparse )
-        return vColumns;
-
-    // recalculate their hash values based on p->pSimsReal
-    pT = p->pTableF0;
-    for ( i = 0; i < pT->nBins; i++ )
-    Fraig_TableBinForEachEntryF( pT->pBins[i], pEntF )
-    {
-        pSims = pEntF->puSimD;
-        pEntF->uHashD = 0;
-        for ( w = 0; w < p->iWordStart; w++ )
-            pEntF->uHashD ^= (pSims[w] & p->pSimsReal[w]) * s_FraigPrimes[w];
-    }
-
-    // rehash the table using these values
-    Fraig_TableRehashF0( p, 1 );
-
-    // collect the classes of equivalent node pairs
-    for ( i = 0; i < pT->nBins; i++ )
-    Fraig_TableBinForEachEntryF( pT->pBins[i], pEntF )
-    {
-        p->vCones->nSize = 0;
-        Fraig_TableBinForEachEntryD( pEntF, pEntD )
-            Fraig_NodeVecPush( p->vCones, pEntD );
-        if ( p->vCones->nSize == 1 )
-            continue;
-
-        // primary simulation patterns (counter-examples) cannot distinguish all these pairs
-        for ( k = 0; k < p->vCones->nSize; k++ )
-            for ( m = k+1; m < p->vCones->nSize; m++ )
-            {
-                // get memory to store the feasible simulation patterns
-                pSims = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims );
-                // find the patterns that are not distinquished
-                pUnsigned1 = p->vCones->pArray[k]->puSimD;
-                pUnsigned2 = p->vCones->pArray[m]->puSimD;
-                for ( w = 0; w < p->iWordStart; w++ )
-                    pSims[w] = (pUnsigned1[w] ^ pUnsigned2[w]) & ~p->pSimsReal[w];
-                // store the pattern
-                Fraig_NodeVecPush( vColumns, (Fraig_Node_t *)pSims );
-//                nOnes = Fraig_BitStringCountOnes(pSims, p->iWordStart);
-//                assert( nOnes > 0 );
-            }      
-    }
-    return vColumns;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Selects the column, which has the smallest number of hits.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_GetSmallestColumn( int * pHits, int nHits )
-{
-    int i, iColMin = -1, nHitsMin = 1000000;
-    for ( i = 0; i < nHits; i++ )
-    {
-        // skip covered columns
-        if ( pHits[i] == 0 )
-            continue;
-        // take the column if it can only be covered by one pattern
-        if ( pHits[i] == 1 )
-            return i;
-        // find the column, which requires the smallest number of patterns
-        if ( nHitsMin > pHits[i] )
-        {
-            nHitsMin = pHits[i];
-            iColMin = i;
-        }
-    }
-    return iColMin;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Select the pattern, which hits this column.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_GetHittingPattern( unsigned * pSims, int nWords )
-{
-    int i, b;
-    for ( i = 0; i < nWords; i++ )
-    {
-        if ( pSims[i] == 0 )
-            continue;
-        for ( b = 0; b < 32; b++ )
-            if ( pSims[i] & (1 << b) )
-                return i * 32 + b;
-    }
-    return -1;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Cancel covered patterns.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_CancelCoveredColumns( Fraig_NodeVec_t * vColumns, int * pHits, int iPat )
-{
-    unsigned * pSims;
-    int i;
-    for ( i = 0; i < vColumns->nSize; i++ )
-    {
-        pSims = (unsigned *)vColumns->pArray[i];
-        if ( Fraig_BitStringHasBit( pSims, iPat ) )
-            pHits[i] = 0;
-    }
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Checks the correctness of the functional simulation table.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_FeedBackCheckTable( Fraig_Man_t * p )
-{
-    Fraig_HashTable_t * pT = p->pTableF;
-    Fraig_Node_t * pEntF, * pEntD;
-    int i, k, m, nPairs;
-
-    nPairs = 0;
-    for ( i = 0; i < pT->nBins; i++ )
-    Fraig_TableBinForEachEntryF( pT->pBins[i], pEntF )
-    {
-        p->vCones->nSize = 0;
-        Fraig_TableBinForEachEntryD( pEntF, pEntD )
-            Fraig_NodeVecPush( p->vCones, pEntD );
-        if ( p->vCones->nSize == 1 )
-            continue;
-        for ( k = 0; k < p->vCones->nSize; k++ )
-            for ( m = k+1; m < p->vCones->nSize; m++ )
-            {
-                if ( Fraig_CompareSimInfo( p->vCones->pArray[k], p->vCones->pArray[m], p->iWordStart, 0 ) )
-                    printf( "Nodes %d and %d have the same D simulation info.\n", 
-                        p->vCones->pArray[k]->Num, p->vCones->pArray[m]->Num );
-                nPairs++;
-            }   
-    }
-//    printf( "\nThe total of %d node pairs have been verified.\n", nPairs );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Checks the correctness of the functional simulation table.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_FeedBackCheckTableF0( Fraig_Man_t * p )
-{
-    Fraig_HashTable_t * pT = p->pTableF0;
-    Fraig_Node_t * pEntF;
-    int i, k, m, nPairs;
-
-    nPairs = 0;
-    for ( i = 0; i < pT->nBins; i++ )
-    {
-        p->vCones->nSize = 0;
-        Fraig_TableBinForEachEntryF( pT->pBins[i], pEntF )
-            Fraig_NodeVecPush( p->vCones, pEntF );
-        if ( p->vCones->nSize == 1 )
-            continue;
-        for ( k = 0; k < p->vCones->nSize; k++ )
-            for ( m = k+1; m < p->vCones->nSize; m++ )
-            {
-                if ( Fraig_CompareSimInfo( p->vCones->pArray[k], p->vCones->pArray[m], p->iWordStart, 0 ) )
-                    printf( "Nodes %d and %d have the same D simulation info.\n", 
-                        p->vCones->pArray[k]->Num, p->vCones->pArray[m]->Num );
-                nPairs++;
-            }   
-    }
-//    printf( "\nThe total of %d node pairs have been verified.\n", nPairs );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Doubles the size of simulation info.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_ReallocateSimulationInfo( Fraig_Man_t * p )
-{
-    Fraig_MemFixed_t * mmSimsNew;        // new memory manager for simulation info
-    Fraig_Node_t * pNode;
-    unsigned * pSimsNew;
-    unsigned uSignOld;
-    int i;
-
-    // allocate a new memory manager
-    p->nWordsDyna *= 2;
-    mmSimsNew = Fraig_MemFixedStart( sizeof(unsigned) * (p->nWordsRand + p->nWordsDyna) );
-
-    // set the new data for the constant node
-    pNode = p->pConst1;
-    pNode->puSimR = (unsigned *)Fraig_MemFixedEntryFetch( mmSimsNew );
-    pNode->puSimD = pNode->puSimR + p->nWordsRand;
-    memset( pNode->puSimR, 0, sizeof(unsigned) * p->nWordsRand );
-    memset( pNode->puSimD, 0, sizeof(unsigned) * p->nWordsDyna );
-
-    // copy the simulation info of the PIs
-    for ( i = 0; i < p->vInputs->nSize; i++ )
-    {
-        pNode = p->vInputs->pArray[i];
-        // copy the simulation info
-        pSimsNew = (unsigned *)Fraig_MemFixedEntryFetch( mmSimsNew );
-        memmove( pSimsNew, pNode->puSimR, sizeof(unsigned) * (p->nWordsRand + p->iWordStart) );
-        // attach the new info
-        pNode->puSimR = pSimsNew;
-        pNode->puSimD = pNode->puSimR + p->nWordsRand;
-        // signatures remain without changes
-    }
-
-    // replace the manager to free up some memory
-    Fraig_MemFixedStop( p->mmSims, 0 );
-    p->mmSims = mmSimsNew;
-
-    // resimulate the internal nodes (this should lead to the same signatures)
-    for ( i = 1; i < p->vNodes->nSize; i++ )
-    {
-        pNode = p->vNodes->pArray[i];
-        if ( !Fraig_NodeIsAnd(pNode) )
-            continue;
-        // allocate memory for the simulation info
-        pNode->puSimR = (unsigned *)Fraig_MemFixedEntryFetch( mmSimsNew );
-        pNode->puSimD = pNode->puSimR + p->nWordsRand;
-        // derive random simulation info
-        uSignOld = pNode->uHashR;
-        pNode->uHashR = 0;
-        Fraig_NodeSimulate( pNode, 0, p->nWordsRand, 1 );
-        assert( uSignOld == pNode->uHashR );
-        // derive dynamic simulation info
-        uSignOld = pNode->uHashD;
-        pNode->uHashD = 0;
-        Fraig_NodeSimulate( pNode, 0, p->iWordStart, 0 );
-        assert( uSignOld == pNode->uHashD );
-    }
-
-    // realloc temporary storage
-    p->pSimsReal = (unsigned *)Fraig_MemFixedEntryFetch( mmSimsNew );
-    memset( p->pSimsReal, 0, sizeof(unsigned) * p->nWordsDyna );
-    p->pSimsTemp = (unsigned *)Fraig_MemFixedEntryFetch( mmSimsNew );
-    p->pSimsDiff = (unsigned *)Fraig_MemFixedEntryFetch( mmSimsNew );
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Generated trivial counter example.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int * Fraig_ManAllocCounterExample( Fraig_Man_t * p )
-{
-    int * pModel;
-    pModel = ABC_ALLOC( int, p->vInputs->nSize );
-    memset( pModel, 0, sizeof(int) * p->vInputs->nSize );
-    return pModel;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Saves the counter example.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_ManSimulateBitNode_rec( Fraig_Man_t * p, Fraig_Node_t * pNode )
-{
-    int Value0, Value1;
-    if ( Fraig_NodeIsTravIdCurrent( p, pNode ) )
-        return pNode->fMark3;
-    Fraig_NodeSetTravIdCurrent( p, pNode );
-    Value0 = Fraig_ManSimulateBitNode_rec( p, Fraig_Regular(pNode->p1) );
-    Value1 = Fraig_ManSimulateBitNode_rec( p, Fraig_Regular(pNode->p2) );
-    Value0 ^= Fraig_IsComplement(pNode->p1);
-    Value1 ^= Fraig_IsComplement(pNode->p2);
-    pNode->fMark3 = Value0 & Value1;
-    return pNode->fMark3;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Simulates one bit.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_ManSimulateBitNode( Fraig_Man_t * p, Fraig_Node_t * pNode, int * pModel )
-{
-    int fCompl, RetValue, i;
-    // set the PI values
-    Fraig_ManIncrementTravId( p );
-    for ( i = 0; i < p->vInputs->nSize; i++ )
-    {
-        Fraig_NodeSetTravIdCurrent( p, p->vInputs->pArray[i] );
-        p->vInputs->pArray[i]->fMark3 = pModel[i];
-    }
-    // perform the traversal
-    fCompl = Fraig_IsComplement(pNode);
-    RetValue = Fraig_ManSimulateBitNode_rec( p, Fraig_Regular(pNode) );
-    return fCompl ^ RetValue;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Saves the counter example.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int * Fraig_ManSaveCounterExample( Fraig_Man_t * p, Fraig_Node_t * pNode )
-{
-    int * pModel;
-    int iPattern;
-    int i, fCompl;
-
-    // the node can be complemented
-    fCompl = Fraig_IsComplement(pNode);
-    // because we compare with constant 0, p->pConst1 should also be complemented
-    fCompl = !fCompl;
-
-    // derive the model
-    pModel = Fraig_ManAllocCounterExample( p );
-    iPattern = Fraig_FindFirstDiff( p->pConst1, Fraig_Regular(pNode), fCompl, p->nWordsRand, 1 );
-    if ( iPattern >= 0 )
-    {
-        for ( i = 0; i < p->vInputs->nSize; i++ )
-            if ( Fraig_BitStringHasBit( p->vInputs->pArray[i]->puSimR, iPattern ) )
-                pModel[i] = 1;
-/*
-printf( "SAT solver's pattern:\n" );
-for ( i = 0; i < p->vInputs->nSize; i++ )
-    printf( "%d", pModel[i] );
-printf( "\n" );
-*/
-        assert( Fraig_ManSimulateBitNode( p, pNode, pModel ) );
-        return pModel;
-    }
-    iPattern = Fraig_FindFirstDiff( p->pConst1, Fraig_Regular(pNode), fCompl, p->iWordStart, 0 );
-    if ( iPattern >= 0 )
-    {
-        for ( i = 0; i < p->vInputs->nSize; i++ )
-            if ( Fraig_BitStringHasBit( p->vInputs->pArray[i]->puSimD, iPattern ) )
-                pModel[i] = 1;
-/*
-printf( "SAT solver's pattern:\n" );
-for ( i = 0; i < p->vInputs->nSize; i++ )
-    printf( "%d", pModel[i] );
-printf( "\n" );
-*/
-        assert( Fraig_ManSimulateBitNode( p, pNode, pModel ) );
-        return pModel;
-    }
-    ABC_FREE( pModel );
-    return NULL;
-}
-
-
-////////////////////////////////////////////////////////////////////////
-///                       END OF FILE                                ///
-////////////////////////////////////////////////////////////////////////
-
-
-ABC_NAMESPACE_IMPL_END
-
diff --git a/src/sat/fraig/fraigInt.h b/src/sat/fraig/fraigInt.h
deleted file mode 100644
index 7cc2194a..00000000
--- a/src/sat/fraig/fraigInt.h
+++ /dev/null
@@ -1,434 +0,0 @@
-/**CFile****************************************************************
-
-  FileName    [fraigInt.h]
-
-  PackageName [FRAIG: Functionally reduced AND-INV graphs.]
-
-  Synopsis    [Internal declarations of the FRAIG package.]
-
-  Author      [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
-  
-  Affiliation [UC Berkeley]
-
-  Date        [Ver. 2.0. Started - October 1, 2004]
-
-  Revision    [$Id: fraigInt.h,v 1.15 2005/07/08 01:01:31 alanmi Exp $]
-
-***********************************************************************/
-
-#ifndef __FRAIG_INT_H__
-#define __FRAIG_INT_H__
-
-
-////////////////////////////////////////////////////////////////////////
-///                          INCLUDES                                ///
-////////////////////////////////////////////////////////////////////////
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <assert.h>
-#include <time.h>
-
-#include "abc_global.h"
-#include "fraig.h"
-#include "msat.h"
-
-ABC_NAMESPACE_HEADER_START
-
-
-////////////////////////////////////////////////////////////////////////
-///                         PARAMETERS                               ///
-////////////////////////////////////////////////////////////////////////
- 
-/*
-    The AIG node policy:
-    - Each node has its main number (pNode->Num)
-      This is the number of this node in the array of all nodes and its SAT variable number
-    - The PI nodes are stored along with other nodes
-      Additionally, PI nodes have a PI number, by which they are stored in the PI node array
-    - The constant node is has number 0 and is also stored in the array
-*/
-
-////////////////////////////////////////////////////////////////////////
-///                       MACRO DEFINITIONS                          ///
-////////////////////////////////////////////////////////////////////////
- 
-// enable this macro to support the fanouts
-#define FRAIG_ENABLE_FANOUTS
-#define FRAIG_PATTERNS_RANDOM   2048   // should not be less than 128 and more than 32768 (2^15)
-#define FRAIG_PATTERNS_DYNAMIC  2048   // should not be less than 256 and more than 32768 (2^15)
-#define FRAIG_MAX_PRIMES        1024   // the maximum number of primes used for hashing
-
-// this parameter determines when simulation info is extended
-// it will be extended when the free storage in the dynamic simulation
-// info is less or equal to this number of words (FRAIG_WORDS_STORE)
-// this is done because if the free storage for dynamic simulation info 
-// is not sufficient, computation becomes inefficient 
-#define FRAIG_WORDS_STORE           5   
-
-// the bit masks
-#define FRAIG_MASK(n)             ((~((unsigned)0)) >> (32-(n)))
-#define FRAIG_FULL                 (~((unsigned)0))
-#define FRAIG_NUM_WORDS(n)         (((n)>>5) + (((n)&31) > 0))
-
-// generating random unsigned (#define RAND_MAX 0x7fff)
-#define FRAIG_RANDOM_UNSIGNED   ((((unsigned)rand()) << 24) ^ (((unsigned)rand()) << 12) ^ ((unsigned)rand()))
-
-// macros to get hold of the bits in a bit string
-#define Fraig_BitStringSetBit(p,i)  ((p)[(i)>>5] |= (1<<((i) & 31)))
-#define Fraig_BitStringXorBit(p,i)  ((p)[(i)>>5] ^= (1<<((i) & 31)))
-#define Fraig_BitStringHasBit(p,i) (((p)[(i)>>5]  & (1<<((i) & 31))) > 0)
-
-// macros to get hold of the bits in the support info
-//#define Fraig_NodeSetVarStr(p,i)      (Fraig_Regular(p)->pSuppStr[((i)%FRAIG_SUPP_SIGN)>>5] |= (1<<(((i)%FRAIG_SUPP_SIGN) & 31)))
-//#define Fraig_NodeHasVarStr(p,i)     ((Fraig_Regular(p)->pSuppStr[((i)%FRAIG_SUPP_SIGN)>>5]  & (1<<(((i)%FRAIG_SUPP_SIGN) & 31))) > 0)
-#define Fraig_NodeSetVarStr(p,i)     Fraig_BitStringSetBit(Fraig_Regular(p)->pSuppStr,i)
-#define Fraig_NodeHasVarStr(p,i)     Fraig_BitStringHasBit(Fraig_Regular(p)->pSuppStr,i)
-
-// copied from "extra.h" for stand-aloneness
-#define Fraig_PrintTime(a,t)      printf( "%s = ", (a) ); printf( "%6.2f sec\n", (float)(t)/(float)(CLOCKS_PER_SEC) )
-
-#define Fraig_HashKey2(a,b,TSIZE) (((ABC_PTRUINT_T)(a) + (ABC_PTRUINT_T)(b) * 12582917) % TSIZE)
-//#define Fraig_HashKey2(a,b,TSIZE) (( ((unsigned)(a)->Num * 19) ^ ((unsigned)(b)->Num * 1999) ) % TSIZE)
-//#define Fraig_HashKey2(a,b,TSIZE) ( ((unsigned)((a)->Num + (b)->Num) * ((a)->Num + (b)->Num + 1) / 2) % TSIZE)
-// the other two hash functions give bad distribution of hash chain lengths (not clear why)
-
-////////////////////////////////////////////////////////////////////////
-///                    STRUCTURE DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-typedef struct Fraig_MemFixed_t_    Fraig_MemFixed_t;    
-
-// the mapping manager
-struct Fraig_ManStruct_t_
-{
-    // the AIG nodes
-    Fraig_NodeVec_t *     vInputs;       // the array of primary inputs
-    Fraig_NodeVec_t *     vNodes;        // the array of all nodes, including primary inputs
-    Fraig_NodeVec_t *     vOutputs;      // the array of primary outputs (some internal nodes)
-    Fraig_Node_t *        pConst1;       // the pointer to the constant node (vNodes->pArray[0])
-
-    // info about the original circuit
-    char **               ppInputNames;  // the primary input names
-    char **               ppOutputNames; // the primary output names
-
-    // various hash-tables
-    Fraig_HashTable_t *   pTableS;       // hashing by structure
-    Fraig_HashTable_t *   pTableF;       // hashing by simulation info
-    Fraig_HashTable_t *   pTableF0;      // hashing by simulation info (sparse functions)
-
-    // parameters
-    int                   nWordsRand;    // the number of words of random simulation info
-    int                   nWordsDyna;    // the number of words of dynamic simulation info
-    int                   nBTLimit;      // the max number of backtracks to perform
-    int                   nSeconds;      // the runtime limit for the miter proof
-    int                   fFuncRed;      // performs only one level hashing
-    int                   fFeedBack;     // enables solver feedback
-    int                   fDist1Pats;    // enables solver feedback
-    int                   fDoSparse;     // performs equiv tests for sparse functions 
-    int                   fChoicing;     // enables recording structural choices
-    int                   fTryProve;     // tries to solve the final miter
-    int                   fVerbose;      // the verbosiness flag
-    int                   fVerboseP;     // the verbosiness flag
-    ABC_INT64_T                nInspLimit;    // the inspection limit
-
-    int                   nTravIds;      // the traversal counter
-    int                   nTravIds2;     // the traversal counter
-
-    // info related to the solver feedback
-    int                   iWordStart;    // the first word to use for simulation
-    int                   iWordPerm;     // the number of words stored permanently
-    int                   iPatsPerm;     // the number of patterns stored permanently
-    Fraig_NodeVec_t *     vCones;        // the temporary array of internal variables
-    Msat_IntVec_t *       vPatsReal;     // the array of real pattern numbers
-    unsigned *            pSimsReal;     // used for simulation patterns
-    unsigned *            pSimsDiff;     // used for simulation patterns
-    unsigned *            pSimsTemp;     // used for simulation patterns
-
-    // the support information
-    int                   nSuppWords;
-    unsigned **           pSuppS;
-    unsigned **           pSuppF;
-
-    // the memory managers
-    Fraig_MemFixed_t *    mmNodes;       // the memory manager for nodes
-    Fraig_MemFixed_t *    mmSims;        // the memory manager for simulation info
-
-    // solving the SAT problem
-    Msat_Solver_t *       pSat;          // the SAT solver
-    Msat_IntVec_t *       vProj;         // the temporary array of projection vars 
-    int                   nSatNums;      // the counter of SAT variables
-    int *                 pModel;        // the assignment, which satisfies the miter
-    // these arrays belong to the solver
-    Msat_IntVec_t *       vVarsInt;      // the temporary array of variables
-    Msat_ClauseVec_t *    vAdjacents;    // the temporary storage for connectivity
-    Msat_IntVec_t *       vVarsUsed;     // the array marking vars appearing in the cone
-
-    // various statistic variables
-    int                   nSatCalls;     // the number of times equivalence checking was called
-    int                   nSatProof;     // the number of times a proof was found
-    int                   nSatCounter;   // the number of times a counter example was found
-    int                   nSatFails;     // the number of times the SAT solver failed to complete due to resource limit or prediction
-    int                   nSatFailsReal; // the number of times the SAT solver failed to complete due to resource limit
-
-    int                   nSatCallsImp;  // the number of times equivalence checking was called
-    int                   nSatProofImp;  // the number of times a proof was found
-    int                   nSatCounterImp;// the number of times a counter example was found
-    int                   nSatFailsImp;  // the number of times the SAT solver failed to complete
-
-    int                   nSatZeros;     // the number of times the simulation vector is zero
-    int                   nSatSupps;     // the number of times the support info was useful
-    int                   nRefErrors;    // the number of ref counting errors
-    int                   nImplies;      // the number of implication cases
-    int                   nSatImpls;     // the number of implication SAT calls
-    int                   nVarsClauses;  // the number of variables with clauses
-    int                   nSimplifies0;
-    int                   nSimplifies1;
-    int                   nImplies0;
-    int                   nImplies1;
-
-    // runtime statistics
-    int                   timeToAig;     // time to transfer to the mapping structure
-    int                   timeSims;      // time to compute k-feasible cuts
-    int                   timeTrav;      // time to traverse the network
-    int                   timeFeed;      // time for solver feedback (recording and resimulating)
-    int                   timeImply;     // time to analyze implications
-    int                   timeSat;       // time to compute the truth table for each cut
-    int                   timeToNet;     // time to transfer back to the network
-    int                   timeTotal;     // the total mapping time
-    int                   time1;         // time to perform one task
-    int                   time2;         // time to perform another task
-    int                   time3;         // time to perform another task
-    int                   time4;         // time to perform another task
-};
-
-// the mapping node
-struct Fraig_NodeStruct_t_ 
-{
-    // various numbers associated with the node
-    int                   Num;           // the unique number (SAT var number) of this node 
-    int                   NumPi;         // if the node is a PI, this is its variable number
-    int                   Level;         // the level of the node
-    int                   nRefs;         // the number of references of the node
-    int                   TravId;        // the traversal ID (use to avoid cleaning marks)
-    int                   TravId2;       // the traversal ID (use to avoid cleaning marks)
-
-    // general information about the node
-    unsigned              fInv     :  1; // the mark to show that simulation info is complemented
-    unsigned              fNodePo  :  1; // the mark used for primary outputs
-    unsigned              fClauses :  1; // the clauses for this node are loaded
-    unsigned              fMark0   :  1; // the mark used for traversals
-    unsigned              fMark1   :  1; // the mark used for traversals
-    unsigned              fMark2   :  1; // the mark used for traversals
-    unsigned              fMark3   :  1; // the mark used for traversals
-    unsigned              fFeedUse :  1; // the presence of the variable in the feedback
-    unsigned              fFeedVal :  1; // the value of the variable in the feedback
-    unsigned              fFailTfo :  1; // the node is in the TFO of the failed SAT run
-    unsigned              nFanouts :  2; // the indicator of fanouts (none, one, or many)
-    unsigned              nOnes    : 20; // the number of 1's in the random sim info
- 
-    // the children of the node
-    Fraig_Node_t *        p1;            // the first child
-    Fraig_Node_t *        p2;            // the second child
-    Fraig_NodeVec_t *     vFanins;       // the fanins of the supergate rooted at this node
-//    Fraig_NodeVec_t *     vFanouts;      // the fanouts of the supergate rooted at this node
-
-    // various linked lists
-    Fraig_Node_t *        pNextS;        // the next node in the structural hash table
-    Fraig_Node_t *        pNextF;        // the next node in the functional (simulation) hash table
-    Fraig_Node_t *        pNextD;        // the next node in the list of nodes based on dynamic simulation
-    Fraig_Node_t *        pNextE;        // the next structural choice (functionally-equivalent node)
-    Fraig_Node_t *        pRepr;         // the canonical functional representative of the node
-
-    // simulation data
-    unsigned              uHashR;        // the hash value for random information
-    unsigned              uHashD;        // the hash value for dynamic information 
-    unsigned *            puSimR;        // the simulation information (random)
-    unsigned *            puSimD;        // the simulation information (dynamic)
-
-    // misc information  
-    Fraig_Node_t *        pData0;        // temporary storage for the corresponding network node
-    Fraig_Node_t *        pData1;        // temporary storage for the corresponding network node
-
-#ifdef FRAIG_ENABLE_FANOUTS
-    // representation of node's fanouts
-    Fraig_Node_t *        pFanPivot;     // the first fanout of this node
-    Fraig_Node_t *        pFanFanin1;    // the next fanout of p1
-    Fraig_Node_t *        pFanFanin2;    // the next fanout of p2
-#endif
-}; 
-
-// the vector of nodes
-struct Fraig_NodeVecStruct_t_
-{
-    int                   nCap;          // the number of allocated entries
-    int                   nSize;         // the number of entries in the array
-    Fraig_Node_t **       pArray;        // the array of nodes
-};
-
-// the hash table 
-struct Fraig_HashTableStruct_t_
-{
-    Fraig_Node_t **       pBins;         // the table bins
-    int                   nBins;         // the size of the table
-    int                   nEntries;      // the total number of entries in the table
-};
-
-// getting hold of the next fanout of the node
-#define Fraig_NodeReadNextFanout( pNode, pFanout )                \
-    ( ( pFanout == NULL )? NULL :                                 \
-        ((Fraig_Regular((pFanout)->p1) == (pNode))?               \
-             (pFanout)->pFanFanin1 : (pFanout)->pFanFanin2) )
-// getting hold of the place where the next fanout will be attached
-#define Fraig_NodeReadNextFanoutPlace( pNode, pFanout )           \
-    ( (Fraig_Regular((pFanout)->p1) == (pNode))?                  \
-         &(pFanout)->pFanFanin1 : &(pFanout)->pFanFanin2 )
-// iterator through the fanouts of the node
-#define Fraig_NodeForEachFanout( pNode, pFanout )                 \
-    for ( pFanout = (pNode)->pFanPivot; pFanout;                  \
-          pFanout = Fraig_NodeReadNextFanout(pNode, pFanout) )
-// safe iterator through the fanouts of the node
-#define Fraig_NodeForEachFanoutSafe( pNode, pFanout, pFanout2 )   \
-    for ( pFanout  = (pNode)->pFanPivot,                          \
-          pFanout2 = Fraig_NodeReadNextFanout(pNode, pFanout);    \
-          pFanout;                                                \
-          pFanout  = pFanout2,                                    \
-          pFanout2 = Fraig_NodeReadNextFanout(pNode, pFanout) )
-
-// iterators through the entries in the linked lists of nodes
-// the list of nodes in the structural hash table
-#define Fraig_TableBinForEachEntryS( pBin, pEnt )                 \
-    for ( pEnt = pBin;                                            \
-          pEnt;                                                   \
-          pEnt = pEnt->pNextS )
-#define Fraig_TableBinForEachEntrySafeS( pBin, pEnt, pEnt2 )      \
-    for ( pEnt = pBin,                                            \
-          pEnt2 = pEnt? pEnt->pNextS: NULL;                       \
-          pEnt;                                                   \
-          pEnt = pEnt2,                                           \
-          pEnt2 = pEnt? pEnt->pNextS: NULL )
-// the list of nodes in the functional (simulation) hash table
-#define Fraig_TableBinForEachEntryF( pBin, pEnt )                 \
-    for ( pEnt = pBin;                                            \
-          pEnt;                                                   \
-          pEnt = pEnt->pNextF )
-#define Fraig_TableBinForEachEntrySafeF( pBin, pEnt, pEnt2 )      \
-    for ( pEnt = pBin,                                            \
-          pEnt2 = pEnt? pEnt->pNextF: NULL;                       \
-          pEnt;                                                   \
-          pEnt = pEnt2,                                           \
-          pEnt2 = pEnt? pEnt->pNextF: NULL )
-// the list of nodes with the same simulation and different functionality
-#define Fraig_TableBinForEachEntryD( pBin, pEnt )                 \
-    for ( pEnt = pBin;                                            \
-          pEnt;                                                   \
-          pEnt = pEnt->pNextD )
-#define Fraig_TableBinForEachEntrySafeD( pBin, pEnt, pEnt2 )      \
-    for ( pEnt = pBin,                                            \
-          pEnt2 = pEnt? pEnt->pNextD: NULL;                       \
-          pEnt;                                                   \
-          pEnt = pEnt2,                                           \
-          pEnt2 = pEnt? pEnt->pNextD: NULL )
-// the list of nodes with the same functionality 
-#define Fraig_TableBinForEachEntryE( pBin, pEnt )                 \
-    for ( pEnt = pBin;                                            \
-          pEnt;                                                   \
-          pEnt = pEnt->pNextE )
-#define Fraig_TableBinForEachEntrySafeE( pBin, pEnt, pEnt2 )      \
-    for ( pEnt = pBin,                                            \
-          pEnt2 = pEnt? pEnt->pNextE: NULL;                       \
-          pEnt;                                                   \
-          pEnt = pEnt2,                                           \
-          pEnt2 = pEnt? pEnt->pNextE: NULL )
-
-////////////////////////////////////////////////////////////////////////
-///                       GLOBAL VARIABLES                           ///
-////////////////////////////////////////////////////////////////////////
-
-////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-/*=== fraigCanon.c =============================================================*/
-extern Fraig_Node_t *      Fraig_NodeAndCanon( Fraig_Man_t * pMan, Fraig_Node_t * p1, Fraig_Node_t * p2 );
-/*=== fraigFanout.c =============================================================*/
-extern void                Fraig_NodeAddFaninFanout( Fraig_Node_t * pFanin, Fraig_Node_t * pFanout );
-extern void                Fraig_NodeRemoveFaninFanout( Fraig_Node_t * pFanin, Fraig_Node_t * pFanoutToRemove );
-extern int                 Fraig_NodeGetFanoutNum( Fraig_Node_t * pNode );
-/*=== fraigFeed.c =============================================================*/
-extern void                Fraig_FeedBackInit( Fraig_Man_t * p );
-extern void                Fraig_FeedBack( Fraig_Man_t * p, int * pModel, Msat_IntVec_t * vVars, Fraig_Node_t * pOld, Fraig_Node_t * pNew );
-extern void                Fraig_FeedBackTest( Fraig_Man_t * p );
-extern int                 Fraig_FeedBackCompress( Fraig_Man_t * p );
-extern int *               Fraig_ManAllocCounterExample( Fraig_Man_t * p );
-extern int *               Fraig_ManSaveCounterExample( Fraig_Man_t * p, Fraig_Node_t * pNode );
-/*=== fraigMan.c =============================================================*/
-extern void                Fraig_ManCreateSolver( Fraig_Man_t * p );
-/*=== fraigMem.c =============================================================*/
-extern Fraig_MemFixed_t *  Fraig_MemFixedStart( int nEntrySize );
-extern void                Fraig_MemFixedStop( Fraig_MemFixed_t * p, int fVerbose );
-extern char *              Fraig_MemFixedEntryFetch( Fraig_MemFixed_t * p );
-extern void                Fraig_MemFixedEntryRecycle( Fraig_MemFixed_t * p, char * pEntry );
-extern void                Fraig_MemFixedRestart( Fraig_MemFixed_t * p );
-extern int                 Fraig_MemFixedReadMemUsage( Fraig_MemFixed_t * p );
-/*=== fraigNode.c =============================================================*/
-extern Fraig_Node_t *      Fraig_NodeCreateConst( Fraig_Man_t * p );
-extern Fraig_Node_t *      Fraig_NodeCreatePi( Fraig_Man_t * p );
-extern Fraig_Node_t *      Fraig_NodeCreate( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 );
-extern void                Fraig_NodeSimulate( Fraig_Node_t * pNode, int iWordStart, int iWordStop, int fUseRand );
-/*=== fraigPrime.c =============================================================*/
-extern int                 s_FraigPrimes[FRAIG_MAX_PRIMES];
-extern unsigned int        Cudd_PrimeFraig( unsigned int  p );
-/*=== fraigSat.c ===============================================================*/
-extern int                 Fraig_NodeIsImplication( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew, int nBTLimit );
-/*=== fraigTable.c =============================================================*/
-extern Fraig_HashTable_t * Fraig_HashTableCreate( int nSize );
-extern void                Fraig_HashTableFree( Fraig_HashTable_t * p );
-extern int                 Fraig_HashTableLookupS( Fraig_Man_t * pMan, Fraig_Node_t * p1, Fraig_Node_t * p2, Fraig_Node_t ** ppNodeRes );
-extern Fraig_Node_t *      Fraig_HashTableLookupF( Fraig_Man_t * pMan, Fraig_Node_t * pNode );
-extern Fraig_Node_t *      Fraig_HashTableLookupF0( Fraig_Man_t * pMan, Fraig_Node_t * pNode );
-extern void                Fraig_HashTableInsertF0( Fraig_Man_t * pMan, Fraig_Node_t * pNode );
-extern int                 Fraig_CompareSimInfo( Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int iWordLast, int fUseRand );
-extern int                 Fraig_CompareSimInfoUnderMask( Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int iWordLast, int fUseRand, unsigned * puMask );
-extern int                 Fraig_FindFirstDiff( Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int fCompl, int iWordLast, int fUseRand );
-extern void                Fraig_CollectXors( Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int iWordLast, int fUseRand, unsigned * puMask );
-extern void                Fraig_TablePrintStatsS( Fraig_Man_t * pMan );
-extern void                Fraig_TablePrintStatsF( Fraig_Man_t * pMan );
-extern void                Fraig_TablePrintStatsF0( Fraig_Man_t * pMan );
-extern int                 Fraig_TableRehashF0( Fraig_Man_t * pMan, int fLinkEquiv );
-/*=== fraigUtil.c ===============================================================*/
-extern int                 Fraig_NodeCountPis( Msat_IntVec_t * vVars, int nVarsPi );
-extern int                 Fraig_NodeCountSuppVars( Fraig_Man_t * p, Fraig_Node_t * pNode, int fSuppStr );
-extern int                 Fraig_NodesCompareSupps( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew );
-extern int                 Fraig_NodeAndSimpleCase_rec( Fraig_Node_t * pOld, Fraig_Node_t * pNew );
-extern int                 Fraig_NodeIsExorType( Fraig_Node_t * pNode );
-extern void                Fraig_ManSelectBestChoice( Fraig_Man_t * p );
-extern int                 Fraig_BitStringCountOnes( unsigned * pString, int nWords );
-extern void                Fraig_PrintBinary( FILE * pFile, unsigned * pSign, int nBits );
-extern int                 Fraig_NodeIsExorType( Fraig_Node_t * pNode );
-extern int                 Fraig_NodeIsExor( Fraig_Node_t * pNode );
-extern int                 Fraig_NodeIsMuxType( Fraig_Node_t * pNode );
-extern Fraig_Node_t *      Fraig_NodeRecognizeMux( Fraig_Node_t * pNode, Fraig_Node_t ** ppNodeT, Fraig_Node_t ** ppNodeE );
-extern int                 Fraig_ManCountExors( Fraig_Man_t * pMan );
-extern int                 Fraig_ManCountMuxes( Fraig_Man_t * pMan );
-extern int                 Fraig_NodeSimsContained( Fraig_Man_t * pMan, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2 );
-extern int                 Fraig_NodeIsInSupergate( Fraig_Node_t * pOld, Fraig_Node_t * pNew );
-extern Fraig_NodeVec_t *   Fraig_CollectSupergate( Fraig_Node_t * pNode, int fStopAtMux );
-extern int                 Fraig_CountPis( Fraig_Man_t * p, Msat_IntVec_t * vVarNums );
-extern void                Fraig_ManIncrementTravId( Fraig_Man_t * pMan );
-extern void                Fraig_NodeSetTravIdCurrent( Fraig_Man_t * pMan, Fraig_Node_t * pNode );
-extern int                 Fraig_NodeIsTravIdCurrent( Fraig_Man_t * pMan, Fraig_Node_t * pNode );
-extern int                 Fraig_NodeIsTravIdPrevious( Fraig_Man_t * pMan, Fraig_Node_t * pNode );
-/*=== fraigVec.c ===============================================================*/
-extern void                Fraig_NodeVecSortByRefCount( Fraig_NodeVec_t * p );
-
-
-
-ABC_NAMESPACE_HEADER_END
-
-#endif
-
-////////////////////////////////////////////////////////////////////////
-///                       END OF FILE                                ///
-////////////////////////////////////////////////////////////////////////
diff --git a/src/sat/fraig/fraigMan.c b/src/sat/fraig/fraigMan.c
deleted file mode 100644
index ba08d793..00000000
--- a/src/sat/fraig/fraigMan.c
+++ /dev/null
@@ -1,545 +0,0 @@
-/**CFile****************************************************************
-
-  FileName    [fraigMan.c]
-
-  PackageName [FRAIG: Functionally reduced AND-INV graphs.]
-
-  Synopsis    [Implementation of the FRAIG manager.]
-
-  Author      [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
-  
-  Affiliation [UC Berkeley]
-
-  Date        [Ver. 2.0. Started - October 1, 2004]
-
-  Revision    [$Id: fraigMan.c,v 1.11 2005/07/08 01:01:31 alanmi Exp $]
-
-***********************************************************************/
-
-#include "fraigInt.h"
-
-ABC_NAMESPACE_IMPL_START
-
-
-////////////////////////////////////////////////////////////////////////
-///                        DECLARATIONS                              ///
-////////////////////////////////////////////////////////////////////////
-
-int timeSelect;
-int timeAssign;
-
-////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-/**Function*************************************************************
-
-  Synopsis    [Sets the default parameters of the package.]
-
-  Description [This set of parameters is tuned for equivalence checking.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Prove_ParamsSetDefault( Prove_Params_t * pParams )
-{
-    // clean the parameter structure 
-    memset( pParams, 0, sizeof(Prove_Params_t) );
-    // general parameters
-    pParams->fUseFraiging         = 1;       // enables fraiging
-    pParams->fUseRewriting        = 1;       // enables rewriting
-    pParams->fUseBdds             = 0;       // enables BDD construction when other methods fail
-    pParams->fVerbose             = 0;       // prints verbose stats
-    // iterations
-    pParams->nItersMax            = 6;       // the number of iterations
-    // mitering 
-    pParams->nMiteringLimitStart  = 5000;    // starting mitering limit
-    pParams->nMiteringLimitMulti  = 2.0;     // multiplicative coefficient to increase the limit in each iteration
-    // rewriting (currently not used)
-    pParams->nRewritingLimitStart = 3;       // the number of rewriting iterations
-    pParams->nRewritingLimitMulti = 1.0;     // multiplicative coefficient to increase the limit in each iteration
-    // fraiging 
-    pParams->nFraigingLimitStart  = 2;       // starting backtrack(conflict) limit
-    pParams->nFraigingLimitMulti  = 8.0;     // multiplicative coefficient to increase the limit in each iteration
-    // last-gasp BDD construction
-    pParams->nBddSizeLimit        = 1000000; // the number of BDD nodes when construction is aborted
-    pParams->fBddReorder          = 1;       // enables dynamic BDD variable reordering
-    // last-gasp mitering
-//    pParams->nMiteringLimitLast   = 1000000; // final mitering limit
-    pParams->nMiteringLimitLast   = 0;       // final mitering limit
-    // global SAT solver limits
-    pParams->nTotalBacktrackLimit = 0;       // global limit on the number of backtracks
-    pParams->nTotalInspectLimit   = 0;       // global limit on the number of clause inspects
-//    pParams->nTotalInspectLimit   = 100000000;  // global limit on the number of clause inspects
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Prints out the current values of CEC engine parameters.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Prove_ParamsPrint( Prove_Params_t * pParams )
-{
-    printf( "CEC enging parameters:\n" );
-    printf( "Fraiging enabled: %s\n", pParams->fUseFraiging? "yes":"no" );
-    printf( "Rewriting enabled: %s\n", pParams->fUseRewriting? "yes":"no" );
-    printf( "BDD construction enabled: %s\n", pParams->fUseBdds? "yes":"no" );
-    printf( "Verbose output enabled: %s\n", pParams->fVerbose? "yes":"no" );
-    printf( "Solver iterations: %d\n", pParams->nItersMax );
-    printf( "Starting mitering limit: %d\n", pParams->nMiteringLimitStart );
-    printf( "Multiplicative coeficient for mitering: %.2f\n", pParams->nMiteringLimitMulti );
-    printf( "Starting number of rewriting iterations: %d\n", pParams->nRewritingLimitStart );
-    printf( "Multiplicative coeficient for rewriting: %.2f\n", pParams->nRewritingLimitMulti );
-    printf( "Starting number of conflicts in fraiging: %.2f\n", pParams->nFraigingLimitMulti );
-    printf( "Multiplicative coeficient for fraiging: %.2f\n", pParams->nRewritingLimitMulti );
-    printf( "BDD size limit for bailing out: %d\n", pParams->nBddSizeLimit );
-    printf( "BDD reordering enabled: %s\n", pParams->fBddReorder? "yes":"no" );
-    printf( "Last-gasp mitering limit: %d\n", pParams->nMiteringLimitLast );
-    printf( "Total conflict limit: %lld\n", pParams->nTotalBacktrackLimit );
-    printf( "Total inspection limit: %lld\n", pParams->nTotalInspectLimit );
-    printf( "Parameter dump complete.\n" );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Sets the default parameters of the package.]
-
-  Description [This set of parameters is tuned for equivalence checking.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_ParamsSetDefault( Fraig_Params_t * pParams )
-{
-    memset( pParams, 0, sizeof(Fraig_Params_t) );
-    pParams->nPatsRand  = FRAIG_PATTERNS_RANDOM;  // the number of words of random simulation info
-    pParams->nPatsDyna  = FRAIG_PATTERNS_DYNAMIC; // the number of words of dynamic simulation info
-    pParams->nBTLimit   = 99;                     // the max number of backtracks to perform
-    pParams->nSeconds   = 20;                     // the max number of seconds to solve the miter
-    pParams->fFuncRed   =  1;                     // performs only one level hashing
-    pParams->fFeedBack  =  1;                     // enables solver feedback
-    pParams->fDist1Pats =  1;                     // enables distance-1 patterns
-    pParams->fDoSparse  =  0;                     // performs equiv tests for sparse functions 
-    pParams->fChoicing  =  0;                     // enables recording structural choices
-    pParams->fTryProve  =  1;                     // tries to solve the final miter
-    pParams->fVerbose   =  0;                     // the verbosiness flag
-    pParams->fVerboseP  =  0;                     // the verbose flag for reporting the proof
-    pParams->fInternal  =  0;                     // the flag indicates the internal run 
-    pParams->nConfLimit =  0;                     // the limit on the number of conflicts
-    pParams->nInspLimit =  0;                     // the limit on the number of inspections
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Sets the default parameters of the package.]
-
-  Description [This set of parameters is tuned for complete FRAIGing.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_ParamsSetDefaultFull( Fraig_Params_t * pParams )
-{
-    memset( pParams, 0, sizeof(Fraig_Params_t) );
-    pParams->nPatsRand  = FRAIG_PATTERNS_RANDOM;  // the number of words of random simulation info
-    pParams->nPatsDyna  = FRAIG_PATTERNS_DYNAMIC; // the number of words of dynamic simulation info
-    pParams->nBTLimit   = -1;                     // the max number of backtracks to perform
-    pParams->nSeconds   = 20;                     // the max number of seconds to solve the miter
-    pParams->fFuncRed   =  1;                     // performs only one level hashing
-    pParams->fFeedBack  =  1;                     // enables solver feedback
-    pParams->fDist1Pats =  1;                     // enables distance-1 patterns
-    pParams->fDoSparse  =  1;                     // performs equiv tests for sparse functions 
-    pParams->fChoicing  =  0;                     // enables recording structural choices
-    pParams->fTryProve  =  0;                     // tries to solve the final miter
-    pParams->fVerbose   =  0;                     // the verbosiness flag
-    pParams->fVerboseP  =  0;                     // the verbose flag for reporting the proof
-    pParams->fInternal  =  0;                     // the flag indicates the internal run 
-    pParams->nConfLimit =  0;                     // the limit on the number of conflicts
-    pParams->nInspLimit =  0;                     // the limit on the number of inspections
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Creates the new FRAIG manager.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Man_t * Fraig_ManCreate( Fraig_Params_t * pParams )
-{
-    Fraig_Params_t Params;
-    Fraig_Man_t * p;
-
-    // set the random seed for simulation
-//    srand( 0xFEEDDEAF );
-    srand( 0xDEADCAFE );
-
-    // set parameters for equivalence checking
-    if ( pParams == NULL )
-        Fraig_ParamsSetDefault( pParams = &Params );
-    // adjust the amount of simulation info
-    if ( pParams->nPatsRand < 128 )
-        pParams->nPatsRand = 128;
-    if ( pParams->nPatsRand > 32768 )
-        pParams->nPatsRand = 32768;
-    if ( pParams->nPatsDyna < 128 )
-        pParams->nPatsDyna = 128;
-    if ( pParams->nPatsDyna > 32768 )
-        pParams->nPatsDyna = 32768;
-    // if reduction is not performed, allocate minimum simulation info
-    if ( !pParams->fFuncRed )
-        pParams->nPatsRand = pParams->nPatsDyna = 128;
-
-    // start the manager
-    p = ABC_ALLOC( Fraig_Man_t, 1 );
-    memset( p, 0, sizeof(Fraig_Man_t) );
-
-    // set the default parameters
-    p->nWordsRand = FRAIG_NUM_WORDS( pParams->nPatsRand );  // the number of words of random simulation info
-    p->nWordsDyna = FRAIG_NUM_WORDS( pParams->nPatsDyna );  // the number of patterns for dynamic simulation info
-    p->nBTLimit   = pParams->nBTLimit;    // -1 means infinite backtrack limit
-    p->nSeconds   = pParams->nSeconds;    // the timeout for the final miter
-    p->fFuncRed   = pParams->fFuncRed;    // enables functional reduction (otherwise, only one-level hashing is performed)
-    p->fFeedBack  = pParams->fFeedBack;   // enables solver feedback (the use of counter-examples in simulation)
-    p->fDist1Pats = pParams->fDist1Pats;  // enables solver feedback (the use of counter-examples in simulation)
-    p->fDoSparse  = pParams->fDoSparse;   // performs equivalence checking for sparse functions (whose sim-info is 0)
-    p->fChoicing  = pParams->fChoicing;   // disable accumulation of structural choices (keeps only the first choice)
-    p->fTryProve  = pParams->fTryProve;   // disable accumulation of structural choices (keeps only the first choice)
-    p->fVerbose   = pParams->fVerbose;    // disable verbose output
-    p->fVerboseP  = pParams->fVerboseP;   // disable verbose output
-    p->nInspLimit = pParams->nInspLimit;  // the limit on the number of inspections
-
-    // start memory managers
-    p->mmNodes    = Fraig_MemFixedStart( sizeof(Fraig_Node_t) );
-    p->mmSims     = Fraig_MemFixedStart( sizeof(unsigned) * (p->nWordsRand + p->nWordsDyna) );
-    // allocate node arrays
-    p->vInputs    = Fraig_NodeVecAlloc( 1000 );    // the array of primary inputs
-    p->vOutputs   = Fraig_NodeVecAlloc( 1000 );    // the array of primary outputs
-    p->vNodes     = Fraig_NodeVecAlloc( 1000 );    // the array of internal nodes
-    // start the tables
-    p->pTableS    = Fraig_HashTableCreate( 1000 ); // hashing by structure
-    p->pTableF    = Fraig_HashTableCreate( 1000 ); // hashing by function
-    p->pTableF0   = Fraig_HashTableCreate( 1000 ); // hashing by function (for sparse functions)
-    // create the constant node
-    p->pConst1    = Fraig_NodeCreateConst( p );
-    // initialize SAT solver feedback data structures
-    Fraig_FeedBackInit( p );
-    // initialize other variables
-    p->vProj      = Msat_IntVecAlloc( 10 ); 
-    p->nTravIds   = 1;
-    p->nTravIds2  = 1;
-    return p;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Deallocates the mapping manager.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_ManFree( Fraig_Man_t * p )
-{
-    int i;
-    if ( p->fVerbose )   
-    {
-        if ( p->fChoicing ) Fraig_ManReportChoices( p );
-        Fraig_ManPrintStats( p );
-//        Fraig_TablePrintStatsS( p );
-//        Fraig_TablePrintStatsF( p );
-//        Fraig_TablePrintStatsF0( p );
-    }
- 
-    for ( i = 0; i < p->vNodes->nSize; i++ )
-        if ( p->vNodes->pArray[i]->vFanins )
-        {
-            Fraig_NodeVecFree( p->vNodes->pArray[i]->vFanins );
-            p->vNodes->pArray[i]->vFanins = NULL;
-        }
-
-    if ( p->vInputs )    Fraig_NodeVecFree( p->vInputs );
-    if ( p->vNodes )     Fraig_NodeVecFree( p->vNodes );
-    if ( p->vOutputs )   Fraig_NodeVecFree( p->vOutputs );
-
-    if ( p->pTableS )    Fraig_HashTableFree( p->pTableS );
-    if ( p->pTableF )    Fraig_HashTableFree( p->pTableF );
-    if ( p->pTableF0 )   Fraig_HashTableFree( p->pTableF0 );
-
-    if ( p->pSat )       Msat_SolverFree( p->pSat );
-    if ( p->vProj )      Msat_IntVecFree( p->vProj );
-    if ( p->vCones )     Fraig_NodeVecFree( p->vCones );
-    if ( p->vPatsReal )  Msat_IntVecFree( p->vPatsReal );
-    if ( p->pModel )     ABC_FREE( p->pModel );
-
-    Fraig_MemFixedStop( p->mmNodes, 0 );
-    Fraig_MemFixedStop( p->mmSims, 0 );
-
-    if ( p->pSuppS )
-    {
-        ABC_FREE( p->pSuppS[0] );
-        ABC_FREE( p->pSuppS );
-    }
-    if ( p->pSuppF )
-    {
-        ABC_FREE( p->pSuppF[0] );
-        ABC_FREE( p->pSuppF );
-    }
-
-    ABC_FREE( p->ppOutputNames );
-    ABC_FREE( p->ppInputNames );
-    ABC_FREE( p );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Prepares the SAT solver to run on the two nodes.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_ManCreateSolver( Fraig_Man_t * p )
-{
-    extern int timeSelect;
-    extern int timeAssign;
-    assert( p->pSat == NULL );
-    // allocate data for SAT solving
-    p->pSat       = Msat_SolverAlloc( 500, 1, 1, 1, 1, 0 );
-    p->vVarsInt   = Msat_SolverReadConeVars( p->pSat );   
-    p->vAdjacents = Msat_SolverReadAdjacents( p->pSat );
-    p->vVarsUsed  = Msat_SolverReadVarsUsed( p->pSat );
-    timeSelect = 0;
-    timeAssign = 0;
-}
-
- 
-/**Function*************************************************************
-
-  Synopsis    [Deallocates the mapping manager.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_ManPrintStats( Fraig_Man_t * p )
-{
-    double nMemory;
-    nMemory = ((double)(p->vInputs->nSize + p->vNodes->nSize) * 
-        (sizeof(Fraig_Node_t) + sizeof(unsigned)*(p->nWordsRand + p->nWordsDyna) /*+ p->nSuppWords*sizeof(unsigned)*/))/(1<<20);
-    printf( "Words: Random = %d. Dynamic = %d. Used = %d. Memory = %0.2f Mb.\n", 
-        p->nWordsRand, p->nWordsDyna, p->iWordPerm, nMemory );
-    printf( "Proof = %d. Counter-example = %d. Fail = %d. FailReal = %d. Zero = %d.\n", 
-        p->nSatProof, p->nSatCounter, p->nSatFails, p->nSatFailsReal, p->nSatZeros );
-    printf( "Nodes: Final = %d. Total = %d. Mux = %d. (Exor = %d.) ClaVars = %d.\n", 
-        Fraig_CountNodes(p,0), p->vNodes->nSize, Fraig_ManCountMuxes(p), Fraig_ManCountExors(p), p->nVarsClauses );
-    if ( p->pSat ) Msat_SolverPrintStats( p->pSat );
-    Fraig_PrintTime( "AIG simulation  ", p->timeSims  );
-    Fraig_PrintTime( "AIG traversal   ", p->timeTrav  );
-    Fraig_PrintTime( "Solver feedback ", p->timeFeed  );
-    Fraig_PrintTime( "SAT solving     ", p->timeSat   );
-    Fraig_PrintTime( "Network update  ", p->timeToNet );
-    Fraig_PrintTime( "TOTAL RUNTIME   ", p->timeTotal );
-    if ( p->time1 > 0 ) { Fraig_PrintTime( "time1", p->time1 ); }
-    if ( p->time2 > 0 ) { Fraig_PrintTime( "time2", p->time2 ); }
-    if ( p->time3 > 0 ) { Fraig_PrintTime( "time3", p->time3 ); }
-    if ( p->time4 > 0 ) { Fraig_PrintTime( "time4", p->time4 ); }
-//    ABC_PRT( "Selection ", timeSelect );
-//    ABC_PRT( "Assignment", timeAssign );
-    fflush( stdout );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Allocates simulation information for all nodes.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_NodeVec_t * Fraig_UtilInfoAlloc( int nSize, int nWords, int fClean )
-{
-    Fraig_NodeVec_t * vInfo;
-    unsigned * pUnsigned;
-    int i;
-    assert( nSize > 0 && nWords > 0 );
-    vInfo = Fraig_NodeVecAlloc( nSize );
-    pUnsigned = ABC_ALLOC( unsigned, nSize * nWords );
-    vInfo->pArray[0] = (Fraig_Node_t *)pUnsigned;
-    if ( fClean )
-        memset( pUnsigned, 0, sizeof(unsigned) * nSize * nWords );
-    for ( i = 1; i < nSize; i++ )
-        vInfo->pArray[i] = (Fraig_Node_t *)(((unsigned *)vInfo->pArray[i-1]) + nWords);
-    vInfo->nSize = nSize;
-    return vInfo;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns simulation info of all nodes.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_NodeVec_t * Fraig_ManGetSimInfo( Fraig_Man_t * p )
-{
-    Fraig_NodeVec_t * vInfo;
-    Fraig_Node_t * pNode;
-    unsigned * pUnsigned;
-    int nRandom, nDynamic;
-    int i, k, nWords;
-
-    nRandom  = Fraig_ManReadPatternNumRandom( p );
-    nDynamic = Fraig_ManReadPatternNumDynamic( p );
-    nWords = nRandom / 32 + nDynamic / 32;
-
-    vInfo = Fraig_UtilInfoAlloc( p->vNodes->nSize, nWords, 0 );
-    for ( i = 0; i < p->vNodes->nSize; i++ )
-    {
-        pNode = p->vNodes->pArray[i];
-        assert( i == pNode->Num );
-        pUnsigned = (unsigned *)vInfo->pArray[i];
-        for ( k = 0; k < nRandom / 32; k++ )
-            pUnsigned[k] = pNode->puSimR[k];
-        for ( k = 0; k < nDynamic / 32; k++ )
-            pUnsigned[nRandom / 32 + k] = pNode->puSimD[k];
-    }
-    return vInfo;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns 1 if A v B is always true based on the siminfo.]
-
-  Description [A v B is always true iff A' * B' is always false.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_ManCheckClauseUsingSimInfo( Fraig_Man_t * p, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2 )
-{
-    int fCompl1, fCompl2, i;
-
-    fCompl1 = 1 ^ Fraig_IsComplement(pNode1) ^ Fraig_Regular(pNode1)->fInv;
-    fCompl2 = 1 ^ Fraig_IsComplement(pNode2) ^ Fraig_Regular(pNode2)->fInv;
-
-    pNode1 = Fraig_Regular(pNode1);
-    pNode2 = Fraig_Regular(pNode2);
-    assert( pNode1 != pNode2 );
-    
-    // check the simulation info
-    if ( fCompl1 && fCompl2 )
-    {
-        for ( i = 0; i < p->nWordsRand; i++ )
-            if ( ~pNode1->puSimR[i] & ~pNode2->puSimR[i] )
-                return 0;
-        for ( i = 0; i < p->iWordStart; i++ )
-            if ( ~pNode1->puSimD[i] & ~pNode2->puSimD[i] )
-                return 0;
-        return 1;
-    }
-    if ( !fCompl1 && fCompl2 )
-    {
-        for ( i = 0; i < p->nWordsRand; i++ )
-            if ( pNode1->puSimR[i] & ~pNode2->puSimR[i] )
-                return 0;
-        for ( i = 0; i < p->iWordStart; i++ )
-            if ( pNode1->puSimD[i] & ~pNode2->puSimD[i] )
-                return 0;
-        return 1;
-    }
-    if ( fCompl1 && !fCompl2 )
-    {
-        for ( i = 0; i < p->nWordsRand; i++ )
-            if ( ~pNode1->puSimR[i] & pNode2->puSimR[i] )
-                return 0;
-        for ( i = 0; i < p->iWordStart; i++ )
-            if ( ~pNode1->puSimD[i] & pNode2->puSimD[i] )
-                return 0;
-        return 1;
-    }
-//    if ( fCompl1 && fCompl2 )
-    {
-        for ( i = 0; i < p->nWordsRand; i++ )
-            if ( pNode1->puSimR[i] & pNode2->puSimR[i] )
-                return 0;
-        for ( i = 0; i < p->iWordStart; i++ )
-            if ( pNode1->puSimD[i] & pNode2->puSimD[i] )
-                return 0;
-        return 1;
-    }
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Adds clauses to the solver.]
-
-  Description [This procedure is used to add external clauses to the solver.
-  The clauses are given by sets of nodes. Each node stands for one literal.
-  If the node is complemented, the literal is negated.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_ManAddClause( Fraig_Man_t * p, Fraig_Node_t ** ppNodes, int nNodes )
-{
-    Fraig_Node_t * pNode;
-    int i, fComp, RetValue;
-    if ( p->pSat == NULL )
-        Fraig_ManCreateSolver( p );
-    // create four clauses
-    Msat_IntVecClear( p->vProj );
-    for ( i = 0; i < nNodes; i++ )
-    {
-        pNode = Fraig_Regular(ppNodes[i]);
-        fComp = Fraig_IsComplement(ppNodes[i]);
-        Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode->Num, fComp) );
-//        printf( "%d(%d) ", pNode->Num, fComp );
-    }
-//    printf( "\n" );
-    RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-    assert( RetValue );
-}
-
-////////////////////////////////////////////////////////////////////////
-///                       END OF FILE                                ///
-////////////////////////////////////////////////////////////////////////
-
-ABC_NAMESPACE_IMPL_END
-
diff --git a/src/sat/fraig/fraigMem.c b/src/sat/fraig/fraigMem.c
deleted file mode 100644
index ef52765e..00000000
--- a/src/sat/fraig/fraigMem.c
+++ /dev/null
@@ -1,251 +0,0 @@
-/**CFile****************************************************************
-
-  FileName    [fraigMem.c]
-
-  PackageName [FRAIG: Functionally reduced AND-INV graphs.]
-
-  Synopsis    [Fixed-size-entry memory manager for the FRAIG package.]
-
-  Author      [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
-  
-  Affiliation [UC Berkeley]
-
-  Date        [Ver. 2.0. Started - October 1, 2004]
-
-  Revision    [$Id: fraigMem.c,v 1.4 2005/07/08 01:01:31 alanmi Exp $]
-
-***********************************************************************/
-
-#include "fraigInt.h"
-
-ABC_NAMESPACE_IMPL_START
-
-
-////////////////////////////////////////////////////////////////////////
-///                        DECLARATIONS                              ///
-////////////////////////////////////////////////////////////////////////
-
-struct Fraig_MemFixed_t_
-{
-    // information about individual entries
-    int           nEntrySize;    // the size of one entry
-    int           nEntriesAlloc; // the total number of entries allocated
-    int           nEntriesUsed;  // the number of entries in use
-    int           nEntriesMax;   // the max number of entries in use
-    char *        pEntriesFree;  // the linked list of free entries
-
-    // this is where the memory is stored
-    int           nChunkSize;    // the size of one chunk
-    int           nChunksAlloc;  // the maximum number of memory chunks 
-    int           nChunks;       // the current number of memory chunks 
-    char **       pChunks;       // the allocated memory
-
-    // statistics
-    int           nMemoryUsed;   // memory used in the allocated entries
-    int           nMemoryAlloc;  // memory allocated
-};
-
-////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-/**Function*************************************************************
-
-  Synopsis    [Starts the internal memory manager.]
-
-  Description [Can only work with entry size at least 4 byte long.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_MemFixed_t * Fraig_MemFixedStart( int nEntrySize )
-{
-    Fraig_MemFixed_t * p;
-
-    p = ABC_ALLOC( Fraig_MemFixed_t, 1 );
-    memset( p, 0, sizeof(Fraig_MemFixed_t) );
-
-    p->nEntrySize    = nEntrySize;
-    p->nEntriesAlloc = 0;
-    p->nEntriesUsed  = 0;
-    p->pEntriesFree  = NULL;
-
-    if ( nEntrySize * (1 << 10) < (1<<16) )
-        p->nChunkSize = (1 << 10);
-    else
-        p->nChunkSize = (1<<16) / nEntrySize;
-    if ( p->nChunkSize < 8 )
-        p->nChunkSize = 8;
-
-    p->nChunksAlloc  = 64;
-    p->nChunks       = 0;
-    p->pChunks       = ABC_ALLOC( char *, p->nChunksAlloc );
-
-    p->nMemoryUsed   = 0;
-    p->nMemoryAlloc  = 0;
-    return p;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Stops the internal memory manager.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_MemFixedStop( Fraig_MemFixed_t * p, int fVerbose )
-{
-    int i;
-    if ( p == NULL )
-        return;
-    if ( fVerbose )
-    {
-        printf( "Fixed memory manager: Entry = %5d. Chunk = %5d. Chunks used = %5d.\n",
-            p->nEntrySize, p->nChunkSize, p->nChunks );
-        printf( "   Entries used = %8d. Entries peak = %8d. Memory used = %8d. Memory alloc = %8d.\n",
-            p->nEntriesUsed, p->nEntriesMax, p->nEntrySize * p->nEntriesUsed, p->nMemoryAlloc );
-    }
-    for ( i = 0; i < p->nChunks; i++ )
-        ABC_FREE( p->pChunks[i] );
-    ABC_FREE( p->pChunks );
-    ABC_FREE( p );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Extracts one entry from the memory manager.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-char * Fraig_MemFixedEntryFetch( Fraig_MemFixed_t * p )
-{
-    char * pTemp;
-    int i;
-
-    // check if there are still free entries
-    if ( p->nEntriesUsed == p->nEntriesAlloc )
-    { // need to allocate more entries
-        assert( p->pEntriesFree == NULL );
-        if ( p->nChunks == p->nChunksAlloc )
-        {
-            p->nChunksAlloc *= 2;
-            p->pChunks = ABC_REALLOC( char *, p->pChunks, p->nChunksAlloc ); 
-        }
-        p->pEntriesFree = ABC_ALLOC( char, p->nEntrySize * p->nChunkSize );
-        p->nMemoryAlloc += p->nEntrySize * p->nChunkSize;
-        // transform these entries into a linked list
-        pTemp = p->pEntriesFree;
-        for ( i = 1; i < p->nChunkSize; i++ )
-        {
-            *((char **)pTemp) = pTemp + p->nEntrySize;
-            pTemp += p->nEntrySize;
-        }
-        // set the last link
-        *((char **)pTemp) = NULL;
-        // add the chunk to the chunk storage
-        p->pChunks[ p->nChunks++ ] = p->pEntriesFree;
-        // add to the number of entries allocated
-        p->nEntriesAlloc += p->nChunkSize;
-    }
-    // incrememt the counter of used entries
-    p->nEntriesUsed++;
-    if ( p->nEntriesMax < p->nEntriesUsed )
-        p->nEntriesMax = p->nEntriesUsed;
-    // return the first entry in the free entry list
-    pTemp = p->pEntriesFree;
-    p->pEntriesFree = *((char **)pTemp);
-    return pTemp;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns one entry into the memory manager.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_MemFixedEntryRecycle( Fraig_MemFixed_t * p, char * pEntry )
-{
-    // decrement the counter of used entries
-    p->nEntriesUsed--;
-    // add the entry to the linked list of free entries
-    *((char **)pEntry) = p->pEntriesFree;
-    p->pEntriesFree = pEntry;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Frees all associated memory and resets the manager.]
-
-  Description [Relocates all the memory except the first chunk.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_MemFixedRestart( Fraig_MemFixed_t * p )
-{
-    int i;
-    char * pTemp;
-
-    // deallocate all chunks except the first one
-    for ( i = 1; i < p->nChunks; i++ )
-        ABC_FREE( p->pChunks[i] );
-    p->nChunks = 1;
-    // transform these entries into a linked list
-    pTemp = p->pChunks[0];
-    for ( i = 1; i < p->nChunkSize; i++ )
-    {
-        *((char **)pTemp) = pTemp + p->nEntrySize;
-        pTemp += p->nEntrySize;
-    }
-    // set the last link
-    *((char **)pTemp) = NULL;
-    // set the free entry list
-    p->pEntriesFree  = p->pChunks[0];
-    // set the correct statistics
-    p->nMemoryAlloc  = p->nEntrySize * p->nChunkSize;
-    p->nMemoryUsed   = 0;
-    p->nEntriesAlloc = p->nChunkSize;
-    p->nEntriesUsed  = 0;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Reports the memory usage.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_MemFixedReadMemUsage( Fraig_MemFixed_t * p )
-{
-    return p->nMemoryAlloc;
-}
-
-////////////////////////////////////////////////////////////////////////
-///                       END OF FILE                                ///
-////////////////////////////////////////////////////////////////////////
-
-
-ABC_NAMESPACE_IMPL_END
-
diff --git a/src/sat/fraig/fraigNode.c b/src/sat/fraig/fraigNode.c
deleted file mode 100644
index 9f95cd46..00000000
--- a/src/sat/fraig/fraigNode.c
+++ /dev/null
@@ -1,318 +0,0 @@
-/**CFile****************************************************************
-
-  FileName    [fraigNode.c]
-
-  PackageName [FRAIG: Functionally reduced AND-INV graphs.]
-
-  Synopsis    [Implementation of the FRAIG node.]
-
-  Author      [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
-  
-  Affiliation [UC Berkeley]
-
-  Date        [Ver. 2.0. Started - October 1, 2004]
-
-  Revision    [$Id: fraigNode.c,v 1.3 2005/07/08 01:01:32 alanmi Exp $]
-
-***********************************************************************/
-
-#include "fraigInt.h"
-
-ABC_NAMESPACE_IMPL_START
-
-
-////////////////////////////////////////////////////////////////////////
-///                        DECLARATIONS                              ///
-////////////////////////////////////////////////////////////////////////
-
-// returns the complemented attribute of the node
-#define Fraig_NodeIsSimComplement(p) (Fraig_IsComplement(p)? !(Fraig_Regular(p)->fInv) : (p)->fInv)
-
-////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-/**Function*************************************************************
-
-  Synopsis    [Creates the constant 1 node.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_NodeCreateConst( Fraig_Man_t * p )
-{
-    Fraig_Node_t * pNode;
-
-    // create the node
-    pNode = (Fraig_Node_t *)Fraig_MemFixedEntryFetch( p->mmNodes );
-    memset( pNode, 0, sizeof(Fraig_Node_t) );
-
-    // assign the number and add to the array of nodes
-    pNode->Num   = p->vNodes->nSize;
-    Fraig_NodeVecPush( p->vNodes,  pNode );
-    pNode->NumPi = -1;  // this is not a PI, so its number is -1
-    pNode->Level =  0;  // just like a PI, it has 0 level
-    pNode->nRefs =  1;  // it is a persistent node, which comes referenced
-    pNode->fInv  =  1;  // the simulation info is complemented
-
-    // create the simulation info
-    pNode->puSimR = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims );
-    pNode->puSimD = pNode->puSimR + p->nWordsRand;
-    memset( pNode->puSimR, 0, sizeof(unsigned) * p->nWordsRand );
-    memset( pNode->puSimD, 0, sizeof(unsigned) * p->nWordsDyna );
-
-    // count the number of ones in the simulation vector
-    pNode->nOnes = p->nWordsRand * sizeof(unsigned) * 8;
-
-    // insert it into the hash table
-    Fraig_HashTableLookupF0( p, pNode );
-    return pNode;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Creates a primary input node.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_NodeCreatePi( Fraig_Man_t * p )
-{
-    Fraig_Node_t * pNode, * pNodeRes;
-    int i, clk;
-
-    // create the node
-    pNode = (Fraig_Node_t *)Fraig_MemFixedEntryFetch( p->mmNodes );
-    memset( pNode, 0, sizeof(Fraig_Node_t) );
-    pNode->puSimR = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims );
-    pNode->puSimD = pNode->puSimR + p->nWordsRand;
-    memset( pNode->puSimD, 0, sizeof(unsigned) * p->nWordsDyna );
-
-    // assign the number and add to the array of nodes
-    pNode->Num   = p->vNodes->nSize;
-    Fraig_NodeVecPush( p->vNodes,  pNode );
-
-    // assign the PI number and add to the array of primary inputs
-    pNode->NumPi = p->vInputs->nSize;   
-    Fraig_NodeVecPush( p->vInputs, pNode );
-
-    pNode->Level =  0;  // PI has 0 level
-    pNode->nRefs =  1;  // it is a persistent node, which comes referenced
-    pNode->fInv  =  0;  // the simulation info of the PI is not complemented
-
-    // derive the simulation info for the new node
-clk = clock();
-    // set the random simulation info for the primary input
-    pNode->uHashR = 0;
-    for ( i = 0; i < p->nWordsRand; i++ )
-    {
-        // generate the simulation info
-        pNode->puSimR[i] = FRAIG_RANDOM_UNSIGNED;
-        // for reasons that take very long to explain, it makes sense to have (0000000...) 
-        // pattern in the set (this helps if we need to return the counter-examples)
-        if ( i == 0 )
-            pNode->puSimR[i] <<= 1;
-        // compute the hash key
-        pNode->uHashR ^= pNode->puSimR[i] * s_FraigPrimes[i];
-    }
-    // count the number of ones in the simulation vector
-    pNode->nOnes = Fraig_BitStringCountOnes( pNode->puSimR, p->nWordsRand );
-
-    // set the systematic simulation info for the primary input
-    pNode->uHashD = 0;
-    for ( i = 0; i < p->iWordStart; i++ )
-    {
-        // generate the simulation info
-        pNode->puSimD[i] = FRAIG_RANDOM_UNSIGNED;
-        // compute the hash key
-        pNode->uHashD ^= pNode->puSimD[i] * s_FraigPrimes[i];
-    }
-p->timeSims += clock() - clk;
-
-    // insert it into the hash table
-    pNodeRes = Fraig_HashTableLookupF( p, pNode );
-    assert( pNodeRes == NULL );
-    // add to the runtime of simulation
-    return pNode;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Creates a new node.]
-
-  Description [This procedure should be called to create the constant
-  node and the PI nodes first.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_NodeCreate( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 )
-{
-    Fraig_Node_t * pNode;
-    int clk;
-
-    // create the node
-    pNode = (Fraig_Node_t *)Fraig_MemFixedEntryFetch( p->mmNodes );
-    memset( pNode, 0, sizeof(Fraig_Node_t) );
-
-    // assign the children
-    pNode->p1  = p1;  Fraig_Ref(p1);  Fraig_Regular(p1)->nRefs++;
-    pNode->p2  = p2;  Fraig_Ref(p2);  Fraig_Regular(p2)->nRefs++;
-
-    // assign the number and add to the array of nodes
-    pNode->Num = p->vNodes->nSize;
-    Fraig_NodeVecPush( p->vNodes,  pNode );
-
-    // assign the PI number
-    pNode->NumPi = -1;
-
-    // compute the level of this node
-    pNode->Level = 1 + ABC_MAX(Fraig_Regular(p1)->Level, Fraig_Regular(p2)->Level);
-    pNode->fInv  = Fraig_NodeIsSimComplement(p1) & Fraig_NodeIsSimComplement(p2);
-    pNode->fFailTfo = Fraig_Regular(p1)->fFailTfo | Fraig_Regular(p2)->fFailTfo;
-
-    // derive the simulation info 
-clk = clock();
-    // allocate memory for the simulation info
-    pNode->puSimR = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims );
-    pNode->puSimD = pNode->puSimR + p->nWordsRand;
-    // derive random simulation info
-    pNode->uHashR = 0;
-    Fraig_NodeSimulate( pNode, 0, p->nWordsRand, 1 );
-    // derive dynamic simulation info
-    pNode->uHashD = 0;
-    Fraig_NodeSimulate( pNode, 0, p->iWordStart, 0 );
-    // count the number of ones in the random simulation info
-    pNode->nOnes = Fraig_BitStringCountOnes( pNode->puSimR, p->nWordsRand );
-    if ( pNode->fInv )
-        pNode->nOnes = p->nWordsRand * 32 - pNode->nOnes;
-    // add to the runtime of simulation
-p->timeSims += clock() - clk;
-
-#ifdef FRAIG_ENABLE_FANOUTS
-    // create the fanout info
-    Fraig_NodeAddFaninFanout( Fraig_Regular(p1), pNode );
-    Fraig_NodeAddFaninFanout( Fraig_Regular(p2), pNode );
-#endif
-    return pNode;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Simulates the node.]
-
-  Description [Simulates the random or dynamic simulation info through 
-  the node. Uses phases of the children to determine their real simulation
-  info. Uses phase of the node to determine the way its simulation info 
-  is stored. The resulting info is guaranteed to be 0 for the first pattern.]
-  
-  SideEffects [This procedure modified the hash value of the simulation info.]
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeSimulate( Fraig_Node_t * pNode, int iWordStart, int iWordStop, int fUseRand )
-{
-    unsigned * pSims, * pSims1, * pSims2;
-    unsigned uHash;
-    int fCompl, fCompl1, fCompl2, i;
-
-    assert( !Fraig_IsComplement(pNode) );
-
-    // get hold of the simulation information
-    pSims  = fUseRand? pNode->puSimR                    : pNode->puSimD;
-    pSims1 = fUseRand? Fraig_Regular(pNode->p1)->puSimR : Fraig_Regular(pNode->p1)->puSimD;
-    pSims2 = fUseRand? Fraig_Regular(pNode->p2)->puSimR : Fraig_Regular(pNode->p2)->puSimD;
-
-    // get complemented attributes of the children using their random info
-    fCompl  = pNode->fInv;
-    fCompl1 = Fraig_NodeIsSimComplement(pNode->p1);
-    fCompl2 = Fraig_NodeIsSimComplement(pNode->p2);
-
-    // simulate
-    uHash = 0;
-    if ( fCompl1 && fCompl2 )
-    {
-        if ( fCompl )
-            for ( i = iWordStart; i < iWordStop; i++ )
-            {
-                pSims[i] = (pSims1[i] | pSims2[i]);
-                uHash ^= pSims[i] * s_FraigPrimes[i];
-            }
-        else
-            for ( i = iWordStart; i < iWordStop; i++ )
-            {
-                pSims[i] = ~(pSims1[i] | pSims2[i]);
-                uHash ^= pSims[i] * s_FraigPrimes[i];
-            }
-    }
-    else if ( fCompl1 && !fCompl2 )
-    {
-        if ( fCompl )
-            for ( i = iWordStart; i < iWordStop; i++ )
-            {
-                pSims[i] = (pSims1[i] | ~pSims2[i]);
-                uHash ^= pSims[i] * s_FraigPrimes[i];
-            }
-        else
-            for ( i = iWordStart; i < iWordStop; i++ )
-            {
-                pSims[i] = (~pSims1[i] & pSims2[i]);
-                uHash ^= pSims[i] * s_FraigPrimes[i];
-            }
-    }
-    else if ( !fCompl1 && fCompl2 )
-    {
-        if ( fCompl )
-            for ( i = iWordStart; i < iWordStop; i++ )
-            {
-                pSims[i] = (~pSims1[i] | pSims2[i]);
-                uHash ^= pSims[i] * s_FraigPrimes[i];
-            }
-        else
-            for ( i = iWordStart; i < iWordStop; i++ )
-            {
-                pSims[i] = (pSims1[i] & ~pSims2[i]);
-                uHash ^= pSims[i] * s_FraigPrimes[i];
-            }
-    }
-    else // if ( !fCompl1 && !fCompl2 )
-    {
-        if ( fCompl )
-            for ( i = iWordStart; i < iWordStop; i++ )
-            {
-                pSims[i] = ~(pSims1[i] & pSims2[i]);
-                uHash ^= pSims[i] * s_FraigPrimes[i];
-            }
-        else
-            for ( i = iWordStart; i < iWordStop; i++ )
-            {
-                pSims[i] = (pSims1[i] & pSims2[i]);
-                uHash ^= pSims[i] * s_FraigPrimes[i];
-            }
-    }
-
-    if ( fUseRand )
-        pNode->uHashR ^= uHash;
-    else
-        pNode->uHashD ^= uHash;
-}
-
-
-////////////////////////////////////////////////////////////////////////
-///                       END OF FILE                                ///
-////////////////////////////////////////////////////////////////////////
-
-ABC_NAMESPACE_IMPL_END
-
diff --git a/src/sat/fraig/fraigPrime.c b/src/sat/fraig/fraigPrime.c
deleted file mode 100644
index 42a079fd..00000000
--- a/src/sat/fraig/fraigPrime.c
+++ /dev/null
@@ -1,149 +0,0 @@
-/**CFile****************************************************************
-
-  FileName    [fraigPrime.c]
-
-  PackageName [FRAIG: Functionally reduced AND-INV graphs.]
-
-  Synopsis    [The table of the first 1000 primes.]
-
-  Author      [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
-  
-  Affiliation [UC Berkeley]
-
-  Date        [Ver. 2.0. Started - October 1, 2004]
-
-  Revision    [$Id: fraigPrime.c,v 1.4 2005/07/08 01:01:32 alanmi Exp $]
-
-***********************************************************************/
-
-#include "fraigInt.h"
-
-ABC_NAMESPACE_IMPL_START
-
-
-////////////////////////////////////////////////////////////////////////
-///                        DECLARATIONS                              ///
-////////////////////////////////////////////////////////////////////////
-
-// The 1,024 smallest prime numbers used to compute the hash value
-// http://www.math.utah.edu/~alfeld/math/primelist.html
-int s_FraigPrimes[FRAIG_MAX_PRIMES] = { 2, 3, 5, 
-7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 
-101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 
-193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 
-293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 
-409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 
-521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 
-641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701, 709, 719, 727, 733, 739, 743, 751, 
-757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 
-881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997, 
-1009, 1013, 1019, 1021, 1031, 1033, 1039, 1049, 1051, 1061, 1063, 1069, 1087, 1091, 
-1093, 1097, 1103, 1109, 1117, 1123, 1129, 1151, 1153, 1163, 1171, 1181, 1187, 1193, 
-1201, 1213, 1217, 1223, 1229, 1231, 1237, 1249, 1259, 1277, 1279, 1283, 1289, 1291, 
-1297, 1301, 1303, 1307, 1319, 1321, 1327, 1361, 1367, 1373, 1381, 1399, 1409, 1423, 
-1427, 1429, 1433, 1439, 1447, 1451, 1453, 1459, 1471, 1481, 1483, 1487, 1489, 1493, 
-1499, 1511, 1523, 1531, 1543, 1549, 1553, 1559, 1567, 1571, 1579, 1583, 1597, 1601, 
-1607, 1609, 1613, 1619, 1621, 1627, 1637, 1657, 1663, 1667, 1669, 1693, 1697, 1699, 
-1709, 1721, 1723, 1733, 1741, 1747, 1753, 1759, 1777, 1783, 1787, 1789, 1801, 1811, 
-1823, 1831, 1847, 1861, 1867, 1871, 1873, 1877, 1879, 1889, 1901, 1907, 1913, 1931, 
-1933, 1949, 1951, 1973, 1979, 1987, 1993, 1997, 1999, 2003, 2011, 2017, 2027, 2029, 
-2039, 2053, 2063, 2069, 2081, 2083, 2087, 2089, 2099, 2111, 2113, 2129, 2131, 2137, 
-2141, 2143, 2153, 2161, 2179, 2203, 2207, 2213, 2221, 2237, 2239, 2243, 2251, 2267, 
-2269, 2273, 2281, 2287, 2293, 2297, 2309, 2311, 2333, 2339, 2341, 2347, 2351, 2357, 
-2371, 2377, 2381, 2383, 2389, 2393, 2399, 2411, 2417, 2423, 2437, 2441, 2447, 2459, 
-2467, 2473, 2477, 2503, 2521, 2531, 2539, 2543, 2549, 2551, 2557, 2579, 2591, 2593, 
-2609, 2617, 2621, 2633, 2647, 2657, 2659, 2663, 2671, 2677, 2683, 2687, 2689, 2693, 
-2699, 2707, 2711, 2713, 2719, 2729, 2731, 2741, 2749, 2753, 2767, 2777, 2789, 2791, 
-2797, 2801, 2803, 2819, 2833, 2837, 2843, 2851, 2857, 2861, 2879, 2887, 2897, 2903, 
-2909, 2917, 2927, 2939, 2953, 2957, 2963, 2969, 2971, 2999, 3001, 3011, 3019, 3023, 
-3037, 3041, 3049, 3061, 3067, 3079, 3083, 3089, 3109, 3119, 3121, 3137, 3163, 3167, 
-3169, 3181, 3187, 3191, 3203, 3209, 3217, 3221, 3229, 3251, 3253, 3257, 3259, 3271, 
-3299, 3301, 3307, 3313, 3319, 3323, 3329, 3331, 3343, 3347, 3359, 3361, 3371, 3373, 
-3389, 3391, 3407, 3413, 3433, 3449, 3457, 3461, 3463, 3467, 3469, 3491, 3499, 3511, 
-3517, 3527, 3529, 3533, 3539, 3541, 3547, 3557, 3559, 3571, 3581, 3583, 3593, 3607, 
-3613, 3617, 3623, 3631, 3637, 3643, 3659, 3671, 3673, 3677, 3691, 3697, 3701, 3709, 
-3719, 3727, 3733, 3739, 3761, 3767, 3769, 3779, 3793, 3797, 3803, 3821, 3823, 3833, 
-3847, 3851, 3853, 3863, 3877, 3881, 3889, 3907, 3911, 3917, 3919, 3923, 3929, 3931, 
-3943, 3947, 3967, 3989, 4001, 4003, 4007, 4013, 4019, 4021, 4027, 4049, 4051, 4057, 
-4073, 4079, 4091, 4093, 4099, 4111, 4127, 4129, 4133, 4139, 4153, 4157, 4159, 4177, 
-4201, 4211, 4217, 4219, 4229, 4231, 4241, 4243, 4253, 4259, 4261, 4271, 4273, 4283, 
-4289, 4297, 4327, 4337, 4339, 4349, 4357, 4363, 4373, 4391, 4397, 4409, 4421, 4423, 
-4441, 4447, 4451, 4457, 4463, 4481, 4483, 4493, 4507, 4513, 4517, 4519, 4523, 4547, 
-4549, 4561, 4567, 4583, 4591, 4597, 4603, 4621, 4637, 4639, 4643, 4649, 4651, 4657, 
-4663, 4673, 4679, 4691, 4703, 4721, 4723, 4729, 4733, 4751, 4759, 4783, 4787, 4789, 
-4793, 4799, 4801, 4813, 4817, 4831, 4861, 4871, 4877, 4889, 4903, 4909, 4919, 4931, 
-4933, 4937, 4943, 4951, 4957, 4967, 4969, 4973, 4987, 4993, 4999, 5003, 5009, 5011, 
-5021, 5023, 5039, 5051, 5059, 5077, 5081, 5087, 5099, 5101, 5107, 5113, 5119, 5147, 
-5153, 5167, 5171, 5179, 5189, 5197, 5209, 5227, 5231, 5233, 5237, 5261, 5273, 5279, 
-5281, 5297, 5303, 5309, 5323, 5333, 5347, 5351, 5381, 5387, 5393, 5399, 5407, 5413, 
-5417, 5419, 5431, 5437, 5441, 5443, 5449, 5471, 5477, 5479, 5483, 5501, 5503, 5507, 
-5519, 5521, 5527, 5531, 5557, 5563, 5569, 5573, 5581, 5591, 5623, 5639, 5641, 5647, 
-5651, 5653, 5657, 5659, 5669, 5683, 5689, 5693, 5701, 5711, 5717, 5737, 5741, 5743, 
-5749, 5779, 5783, 5791, 5801, 5807, 5813, 5821, 5827, 5839, 5843, 5849, 5851, 5857, 
-5861, 5867, 5869, 5879, 5881, 5897, 5903, 5923, 5927, 5939, 5953, 5981, 5987, 6007, 
-6011, 6029, 6037, 6043, 6047, 6053, 6067, 6073, 6079, 6089, 6091, 6101, 6113, 6121, 
-6131, 6133, 6143, 6151, 6163, 6173, 6197, 6199, 6203, 6211, 6217, 6221, 6229, 6247, 
-6257, 6263, 6269, 6271, 6277, 6287, 6299, 6301, 6311, 6317, 6323, 6329, 6337, 6343, 
-6353, 6359, 6361, 6367, 6373, 6379, 6389, 6397, 6421, 6427, 6449, 6451, 6469, 6473, 
-6481, 6491, 6521, 6529, 6547, 6551, 6553, 6563, 6569, 6571, 6577, 6581, 6599, 6607, 
-6619, 6637, 6653, 6659, 6661, 6673, 6679, 6689, 6691, 6701, 6703, 6709, 6719, 6733, 
-6737, 6761, 6763, 6779, 6781, 6791, 6793, 6803, 6823, 6827, 6829, 6833, 6841, 6857, 
-6863, 6869, 6871, 6883, 6899, 6907, 6911, 6917, 6947, 6949, 6959, 6961, 6967, 6971, 
-6977, 6983, 6991, 6997, 7001, 7013, 7019, 7027, 7039, 7043, 7057, 7069, 7079, 7103, 
-7109, 7121, 7127, 7129, 7151, 7159, 7177, 7187, 7193, 7207, 7211, 7213, 7219, 7229, 
-7237, 7243, 7247, 7253, 7283, 7297, 7307, 7309, 7321, 7331, 7333, 7349, 7351, 7369, 
-7393, 7411, 7417, 7433, 7451, 7457, 7459, 7477, 7481, 7487, 7489, 7499, 7507, 7517, 
-7523, 7529, 7537, 7541, 7547, 7549, 7559, 7561, 7573, 7577, 7583, 7589, 7591, 7603, 
-7607, 7621, 7639, 7643, 7649, 7669, 7673, 7681, 7687, 7691, 7699, 7703, 7717, 7723, 
-7727, 7741, 7753, 7757, 7759, 7789, 7793, 7817, 7823, 7829, 7841, 7853, 7867, 7873, 
-7877, 7879, 7883, 7901, 7907, 7919, 7927, 7933, 7937, 7949, 7951, 7963, 7993, 8009, 
-8011, 8017, 8039, 8053, 8059, 8069, 8081, 8087, 8089, 8093, 8101, 8111, 8117, 8123, 
-8147, 8161 };
-
-////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-/**Function********************************************************************
-
-  Synopsis    [Returns the next prime &gt;= p.]
-
-  Description [Copied from CUDD, for stand-aloneness.]
-
-  SideEffects [None]
-
-  SeeAlso     []
-
-******************************************************************************/
-unsigned int Cudd_PrimeFraig( unsigned int  p)
-{
-    int i,pn;
-
-    p--;
-    do {
-        p++;
-        if (p&1) {
-        pn = 1;
-        i = 3;
-        while ((unsigned) (i * i) <= p) {
-        if (p % i == 0) {
-            pn = 0;
-            break;
-        }
-        i += 2;
-        }
-    } else {
-        pn = 0;
-    }
-    } while (!pn);
-    return(p);
-
-} /* end of Cudd_Prime */
-
-////////////////////////////////////////////////////////////////////////
-///                       END OF FILE                                ///
-////////////////////////////////////////////////////////////////////////
-
-
-ABC_NAMESPACE_IMPL_END
-
diff --git a/src/sat/fraig/fraigSat.c b/src/sat/fraig/fraigSat.c
deleted file mode 100644
index b96bc5a1..00000000
--- a/src/sat/fraig/fraigSat.c
+++ /dev/null
@@ -1,1459 +0,0 @@
-/**CFile****************************************************************
-
-  FileName    [fraigSat.c]
-
-  PackageName [FRAIG: Functionally reduced AND-INV graphs.]
-
-  Synopsis    [Proving functional equivalence using SAT.]
-
-  Author      [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
-  
-  Affiliation [UC Berkeley]
-
-  Date        [Ver. 2.0. Started - October 1, 2004]
-
-  Revision    [$Id: fraigSat.c,v 1.10 2005/07/08 01:01:32 alanmi Exp $]
-
-***********************************************************************/
-
-#include <math.h>
-#include "fraigInt.h"
-#include "msatInt.h"
-
-ABC_NAMESPACE_IMPL_START
-
-
-////////////////////////////////////////////////////////////////////////
-///                        DECLARATIONS                              ///
-////////////////////////////////////////////////////////////////////////
-
-static void Fraig_OrderVariables( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew );
-static void Fraig_SetupAdjacent( Fraig_Man_t * pMan, Msat_IntVec_t * vConeVars );
-static void Fraig_SetupAdjacentMark( Fraig_Man_t * pMan, Msat_IntVec_t * vConeVars );
-static void Fraig_PrepareCones( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew );
-static void Fraig_PrepareCones_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode );
-
-static void Fraig_SupergateAddClauses( Fraig_Man_t * pMan, Fraig_Node_t * pNode, Fraig_NodeVec_t * vSuper );
-static void Fraig_SupergateAddClausesExor( Fraig_Man_t * pMan, Fraig_Node_t * pNode );
-static void Fraig_SupergateAddClausesMux( Fraig_Man_t * pMan, Fraig_Node_t * pNode );
-//static void Fraig_DetectFanoutFreeCone( Fraig_Man_t * pMan, Fraig_Node_t * pNode );
-static void Fraig_DetectFanoutFreeConeMux( Fraig_Man_t * pMan, Fraig_Node_t * pNode );
-static void Fraig_SetActivity( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew );
-
-// The lesson learned seems to be that variable should be in reverse topological order
-// from the output of the miter. The ordering of adjacency lists is very important.
-// The best way seems to be fanins followed by fanouts. Slight changes to this order
-// leads to big degradation in quality.
-
-static int nMuxes;
-
-////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-/**Function*************************************************************
-
-  Synopsis    [Checks equivalence of two nodes.]
-
-  Description [Returns 1 iff the nodes are equivalent.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodesAreEqual( Fraig_Man_t * p, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int nBTLimit, int nTimeLimit )
-{
-    if ( pNode1 == pNode2 )
-        return 1;
-    if ( pNode1 == Fraig_Not(pNode2) )
-        return 0;
-    return Fraig_NodeIsEquivalent( p, Fraig_Regular(pNode1), Fraig_Regular(pNode2), nBTLimit, nTimeLimit );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Tries to prove the final miter.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_ManProveMiter( Fraig_Man_t * p )
-{
-    Fraig_Node_t * pNode;
-    int i, clk;
-
-    if ( !p->fTryProve )
-        return;
- 
-    clk = clock();
-    // consider all outputs of the multi-output miter
-    for ( i = 0; i < p->vOutputs->nSize; i++ )
-    {
-        pNode = Fraig_Regular(p->vOutputs->pArray[i]);
-        // skip already constant nodes
-        if ( pNode == p->pConst1 )
-            continue;
-        // skip nodes that are different according to simulation
-        if ( !Fraig_CompareSimInfo( pNode, p->pConst1, p->nWordsRand, 1 ) )
-            continue;
-        if ( Fraig_NodeIsEquivalent( p, p->pConst1, pNode, -1, p->nSeconds ) )
-        {
-            if ( Fraig_IsComplement(p->vOutputs->pArray[i]) ^ Fraig_NodeComparePhase(p->pConst1, pNode) )
-                p->vOutputs->pArray[i] = Fraig_Not(p->pConst1);
-            else
-                p->vOutputs->pArray[i] = p->pConst1;
-        }
-    }
-    if ( p->fVerboseP ) 
-    {
-//        ABC_PRT( "Final miter proof time", clock() - clk );
-    }
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns 1 if the miter is unsat; 0 if sat; -1 if undecided.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_ManCheckMiter( Fraig_Man_t * p )
-{
-    Fraig_Node_t * pNode;
-    int i;
-    ABC_FREE( p->pModel );
-    for ( i = 0; i < p->vOutputs->nSize; i++ )
-    {
-        // get the output node (it can be complemented!)
-        pNode = p->vOutputs->pArray[i];
-        // if the miter is constant 0, the problem is UNSAT
-        if ( pNode == Fraig_Not(p->pConst1) )
-            continue;
-        // consider the special case when the miter is constant 1
-        if ( pNode == p->pConst1 )
-        {
-            // in this case, any counter example will do to distinquish it from constant 0
-            // here we pick the counter example composed of all zeros
-            p->pModel = Fraig_ManAllocCounterExample( p );
-            return 0;
-        }
-        // save the counter example
-        p->pModel = Fraig_ManSaveCounterExample( p, pNode );
-        // if the model is not found, return undecided
-        if ( p->pModel == NULL )
-            return -1;
-        else
-            return 0;
-    }
-    return 1;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Returns 1 if pOld is in the TFI of pNew.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_MarkTfi_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode )
-{
-    // skip the visited node
-    if ( pNode->TravId == pMan->nTravIds )
-        return 0;
-    pNode->TravId = pMan->nTravIds;
-    // skip the PI node
-    if ( pNode->NumPi >= 0 )
-        return 1;
-    // check the children
-    return Fraig_MarkTfi_rec( pMan, Fraig_Regular(pNode->p1) ) +
-           Fraig_MarkTfi_rec( pMan, Fraig_Regular(pNode->p2) );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns 1 if pOld is in the TFI of pNew.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_MarkTfi2_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode )
-{
-    // skip the visited node
-    if ( pNode->TravId == pMan->nTravIds )
-        return 0;
-    // skip the boundary node
-    if ( pNode->TravId == pMan->nTravIds-1 )
-    {
-        pNode->TravId = pMan->nTravIds;
-        return 1;
-    }
-    pNode->TravId = pMan->nTravIds;
-    // skip the PI node
-    if ( pNode->NumPi >= 0 )
-        return 1;
-    // check the children
-    return Fraig_MarkTfi2_rec( pMan, Fraig_Regular(pNode->p1) ) +
-           Fraig_MarkTfi2_rec( pMan, Fraig_Regular(pNode->p2) );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns 1 if pOld is in the TFI of pNew.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_MarkTfi3_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode )
-{
-    // skip the visited node
-    if ( pNode->TravId == pMan->nTravIds )
-        return 1;
-    // skip the boundary node
-    if ( pNode->TravId == pMan->nTravIds-1 )
-    {
-        pNode->TravId = pMan->nTravIds;
-        return 1;
-    }
-    pNode->TravId = pMan->nTravIds;
-    // skip the PI node
-    if ( pNode->NumPi >= 0 )
-        return 0;
-    // check the children
-    return Fraig_MarkTfi3_rec( pMan, Fraig_Regular(pNode->p1) ) *
-           Fraig_MarkTfi3_rec( pMan, Fraig_Regular(pNode->p2) );
-}
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_VarsStudy( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew )
-{
-    int NumPis, NumCut, fContain;
-
-    // mark the TFI of pNew
-    p->nTravIds++;
-    NumPis = Fraig_MarkTfi_rec( p, pNew );
-    printf( "(%d)(%d,%d):", NumPis, pOld->Level, pNew->Level );
-
-    // check if the old is in the TFI
-    if ( pOld->TravId == p->nTravIds )
-    {
-        printf( "* " );
-        return;
-    }
-
-    // count the boundary of nodes in pOld
-    p->nTravIds++;
-    NumCut = Fraig_MarkTfi2_rec( p, pOld );
-    printf( "%d", NumCut );
-
-    // check if the new is contained in the old's support
-    p->nTravIds++;
-    fContain = Fraig_MarkTfi3_rec( p, pNew );
-    printf( "%c ", fContain? '+':'-' );
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Checks whether two nodes are functinally equivalent.]
-
-  Description [The flag (fComp) tells whether the nodes to be checked
-  are in the opposite polarity. The second flag (fSkipZeros) tells whether
-  the checking should be performed if the simulation vectors are zeros.
-  Returns 1 if the nodes are equivalent; 0 othewise.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeIsEquivalent( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew, int nBTLimit, int nTimeLimit )
-{
-    int RetValue, RetValue1, i, fComp, clk;
-    int fVerbose = 0;
-    int fSwitch = 0;
-
-    // make sure the nodes are not complemented
-    assert( !Fraig_IsComplement(pNew) );
-    assert( !Fraig_IsComplement(pOld) );
-    assert( pNew != pOld );
-
-    // if at least one of the nodes is a failed node, perform adjustments:
-    // if the backtrack limit is small, simply skip this node
-    // if the backtrack limit is > 10, take the quare root of the limit
-    if ( nBTLimit > 0 && (pOld->fFailTfo || pNew->fFailTfo) )
-    {
-        p->nSatFails++;
-//            return 0;
-//        if ( nBTLimit > 10 )
-//            nBTLimit /= 10;
-        if ( nBTLimit <= 10 )
-            return 0;
-        nBTLimit = (int)sqrt((double)nBTLimit);
-//        fSwitch = 1;
-    }
-
-    p->nSatCalls++;
-
-    // make sure the solver is allocated and has enough variables
-    if ( p->pSat == NULL )
-        Fraig_ManCreateSolver( p );
-    // make sure the SAT solver has enough variables
-    for ( i = Msat_SolverReadVarNum(p->pSat); i < p->vNodes->nSize; i++ )
-        Msat_SolverAddVar( p->pSat, p->vNodes->pArray[i]->Level );
-
-
- 
-/*
-    {
-        Fraig_Node_t * ppNodes[2] = { pOld, pNew };
-        extern void Fraig_MappingShowNodes( Fraig_Man_t * pMan, Fraig_Node_t ** ppRoots, int nRoots, char * pFileName );
-        Fraig_MappingShowNodes( p, ppNodes, 2, "temp_aig" );
-    }
-*/
-
-    nMuxes = 0;
-
-
-    // get the logic cone
-clk = clock();
-//    Fraig_VarsStudy( p, pOld, pNew );
-    Fraig_OrderVariables( p, pOld, pNew );
-//    Fraig_PrepareCones( p, pOld, pNew );
-p->timeTrav += clock() - clk;
-
-//    printf( "The number of MUXes detected = %d (%5.2f %% of logic).  ", nMuxes, 300.0*nMuxes/(p->vNodes->nSize - p->vInputs->nSize) );
-//    ABC_PRT( "Time", clock() - clk );
-
-if ( fVerbose )
-    printf( "%d(%d) - ", Fraig_CountPis(p,p->vVarsInt), Msat_IntVecReadSize(p->vVarsInt) );
-
-
-    // prepare variable activity
-    Fraig_SetActivity( p, pOld, pNew );
-
-    // get the complemented attribute
-    fComp = Fraig_NodeComparePhase( pOld, pNew );
-//Msat_SolverPrintClauses( p->pSat );
-
-    ////////////////////////////////////////////
-    // prepare the solver to run incrementally on these variables
-//clk = clock();
-    Msat_SolverPrepare( p->pSat, p->vVarsInt );
-//p->time3 += clock() - clk;
-
-
-    // solve under assumptions
-    // A = 1; B = 0     OR     A = 1; B = 1 
-    Msat_IntVecClear( p->vProj );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 0) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, !fComp) );
-
-//Msat_SolverWriteDimacs( p->pSat, "temp_fraig.cnf" );
-
-    // run the solver
-clk = clock();
-    RetValue1 = Msat_SolverSolve( p->pSat, p->vProj, nBTLimit, nTimeLimit );
-p->timeSat += clock() - clk;
-
-    if ( RetValue1 == MSAT_FALSE )
-    {
-//p->time1 += clock() - clk;
-
-if ( fVerbose )
-{
-//    printf( "unsat  %d  ", Msat_SolverReadBackTracks(p->pSat) );
-//ABC_PRT( "time", clock() - clk );
-}
-
-        // add the clause
-        Msat_IntVecClear( p->vProj );
-        Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 1) );
-        Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, fComp) );
-        RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-        assert( RetValue );
-        // continue solving the other implication
-    }
-    else if ( RetValue1 == MSAT_TRUE )
-    {
-//p->time2 += clock() - clk;
-
-if ( fVerbose )
-{
-//    printf( "sat  %d  ", Msat_SolverReadBackTracks(p->pSat) );
-//ABC_PRT( "time", clock() - clk );
-}
-
-        // record the counter example
-        Fraig_FeedBack( p, Msat_SolverReadModelArray(p->pSat), p->vVarsInt, pOld, pNew );
-
-//        if ( pOld->fFailTfo || pNew->fFailTfo )
-//            printf( "*" );
-//        printf( "s(%d)", pNew->Level );
-        if ( fSwitch )
-             printf( "s(%d)", pNew->Level );
-        p->nSatCounter++;
-        return 0;
-    }
-    else // if ( RetValue1 == MSAT_UNKNOWN )
-    {
-p->time3 += clock() - clk;
-
-//        if ( pOld->fFailTfo || pNew->fFailTfo )
-//            printf( "*" );
-//        printf( "T(%d)", pNew->Level );
-
-        // mark the node as the failed node
-        if ( pOld != p->pConst1 ) 
-            pOld->fFailTfo = 1;
-        pNew->fFailTfo = 1;
-//        p->nSatFails++;
-        if ( fSwitch )
-             printf( "T(%d)", pNew->Level );
-        p->nSatFailsReal++;
-        return 0;
-    }
-
-    // if the old node was constant 0, we already know the answer
-    if ( pOld == p->pConst1 )
-        return 1;
-
-    ////////////////////////////////////////////
-    // prepare the solver to run incrementally 
-//clk = clock();
-    Msat_SolverPrepare( p->pSat, p->vVarsInt );
-//p->time3 += clock() - clk;
-    // solve under assumptions
-    // A = 0; B = 1     OR     A = 0; B = 0 
-    Msat_IntVecClear( p->vProj );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 1) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, fComp) );
-    // run the solver
-clk = clock();
-    RetValue1 = Msat_SolverSolve( p->pSat, p->vProj, nBTLimit, nTimeLimit );
-p->timeSat += clock() - clk;
-
-    if ( RetValue1 == MSAT_FALSE )
-    {
-//p->time1 += clock() - clk;
-
-if ( fVerbose )
-{
-//    printf( "unsat  %d  ", Msat_SolverReadBackTracks(p->pSat) );
-//ABC_PRT( "time", clock() - clk );
-}
-
-        // add the clause
-        Msat_IntVecClear( p->vProj );
-        Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 0) );
-        Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, !fComp) );
-        RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-        assert( RetValue );
-        // continue solving the other implication
-    }
-    else if ( RetValue1 == MSAT_TRUE )
-    {
-//p->time2 += clock() - clk;
-
-if ( fVerbose )
-{
-//    printf( "sat  %d  ", Msat_SolverReadBackTracks(p->pSat) );
-//ABC_PRT( "time", clock() - clk );
-}
-
-        // record the counter example
-        Fraig_FeedBack( p, Msat_SolverReadModelArray(p->pSat), p->vVarsInt, pOld, pNew );
-        p->nSatCounter++;
-
-//        if ( pOld->fFailTfo || pNew->fFailTfo )
-//            printf( "*" );
-//        printf( "s(%d)", pNew->Level );
-        if ( fSwitch )
-             printf( "s(%d)", pNew->Level );
-        return 0;
-    }
-    else // if ( RetValue1 == MSAT_UNKNOWN )
-    {
-p->time3 += clock() - clk;
-
-//        if ( pOld->fFailTfo || pNew->fFailTfo )
-//            printf( "*" );
-//        printf( "T(%d)", pNew->Level );
-        if ( fSwitch )
-             printf( "T(%d)", pNew->Level );
-
-        // mark the node as the failed node
-        pOld->fFailTfo = 1;
-        pNew->fFailTfo = 1;
-//        p->nSatFails++;
-        p->nSatFailsReal++;
-        return 0;
-    }
-
-    // return SAT proof
-    p->nSatProof++;
-
-//    if ( pOld->fFailTfo || pNew->fFailTfo )
-//        printf( "*" );
-//    printf( "u(%d)", pNew->Level );
-
-    if ( fSwitch )
-         printf( "u(%d)", pNew->Level );
-
-    return 1;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Checks whether pOld => pNew.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeIsImplication( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew, int nBTLimit )
-{
-    int RetValue, RetValue1, i, fComp, clk;
-    int fVerbose = 0;
-
-    // make sure the nodes are not complemented
-    assert( !Fraig_IsComplement(pNew) );
-    assert( !Fraig_IsComplement(pOld) );
-    assert( pNew != pOld );
-
-    p->nSatCallsImp++;
-
-    // make sure the solver is allocated and has enough variables
-    if ( p->pSat == NULL )
-        Fraig_ManCreateSolver( p );
-    // make sure the SAT solver has enough variables
-    for ( i = Msat_SolverReadVarNum(p->pSat); i < p->vNodes->nSize; i++ )
-        Msat_SolverAddVar( p->pSat, p->vNodes->pArray[i]->Level );
-
-   // get the logic cone
-clk = clock();
-    Fraig_OrderVariables( p, pOld, pNew );
-//    Fraig_PrepareCones( p, pOld, pNew );
-p->timeTrav += clock() - clk;
-
-if ( fVerbose )
-    printf( "%d(%d) - ", Fraig_CountPis(p,p->vVarsInt), Msat_IntVecReadSize(p->vVarsInt) );
-
-
-    // get the complemented attribute
-    fComp = Fraig_NodeComparePhase( pOld, pNew );
-//Msat_SolverPrintClauses( p->pSat );
-
-    ////////////////////////////////////////////
-    // prepare the solver to run incrementally on these variables
-//clk = clock();
-    Msat_SolverPrepare( p->pSat, p->vVarsInt );
-//p->time3 += clock() - clk;
-
-    // solve under assumptions
-    // A = 1; B = 0     OR     A = 1; B = 1 
-    Msat_IntVecClear( p->vProj );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 0) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, !fComp) );
-    // run the solver
-clk = clock();
-    RetValue1 = Msat_SolverSolve( p->pSat, p->vProj, nBTLimit, 1000000 );
-p->timeSat += clock() - clk;
-
-    if ( RetValue1 == MSAT_FALSE )
-    {
-//p->time1 += clock() - clk;
-
-if ( fVerbose )
-{
-//    printf( "unsat  %d  ", Msat_SolverReadBackTracks(p->pSat) );
-//ABC_PRT( "time", clock() - clk );
-}
-
-        // add the clause
-        Msat_IntVecClear( p->vProj );
-        Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 1) );
-        Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, fComp) );
-        RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-        assert( RetValue );
-//        p->nSatProofImp++;
-        return 1;
-    }
-    else if ( RetValue1 == MSAT_TRUE )
-    {
-//p->time2 += clock() - clk;
-
-if ( fVerbose )
-{
-//    printf( "sat  %d  ", Msat_SolverReadBackTracks(p->pSat) );
-//ABC_PRT( "time", clock() - clk );
-}
-        // record the counter example
-        Fraig_FeedBack( p, Msat_SolverReadModelArray(p->pSat), p->vVarsInt, pOld, pNew );
-        p->nSatCounterImp++;
-        return 0;
-    }
-    else // if ( RetValue1 == MSAT_UNKNOWN )
-    {
-p->time3 += clock() - clk;
-        p->nSatFailsImp++;
-        return 0;
-    }
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Prepares the SAT solver to run on the two nodes.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_ManCheckClauseUsingSat( Fraig_Man_t * p, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int nBTLimit )
-{
-    Fraig_Node_t * pNode1R, * pNode2R;
-    int RetValue, RetValue1, i, clk;
-    int fVerbose = 0;
-
-    pNode1R = Fraig_Regular(pNode1);
-    pNode2R = Fraig_Regular(pNode2);
-    assert( pNode1R != pNode2R );
-
-    // make sure the solver is allocated and has enough variables
-    if ( p->pSat == NULL )
-        Fraig_ManCreateSolver( p );
-    // make sure the SAT solver has enough variables
-    for ( i = Msat_SolverReadVarNum(p->pSat); i < p->vNodes->nSize; i++ )
-        Msat_SolverAddVar( p->pSat, p->vNodes->pArray[i]->Level );
-
-   // get the logic cone
-clk = clock();
-    Fraig_OrderVariables( p, pNode1R, pNode2R );
-//    Fraig_PrepareCones( p, pNode1R, pNode2R );
-p->timeTrav += clock() - clk;
-
-    ////////////////////////////////////////////
-    // prepare the solver to run incrementally on these variables
-//clk = clock();
-    Msat_SolverPrepare( p->pSat, p->vVarsInt );
-//p->time3 += clock() - clk;
-
-    // solve under assumptions
-    // A = 1; B = 0     OR     A = 1; B = 1 
-    Msat_IntVecClear( p->vProj );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode1R->Num, !Fraig_IsComplement(pNode1)) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode2R->Num, !Fraig_IsComplement(pNode2)) );
-    // run the solver
-clk = clock();
-    RetValue1 = Msat_SolverSolve( p->pSat, p->vProj, nBTLimit, 1000000 );
-p->timeSat += clock() - clk;
-
-    if ( RetValue1 == MSAT_FALSE )
-    {
-//p->time1 += clock() - clk;
-
-if ( fVerbose )
-{
-//    printf( "unsat  %d  ", Msat_SolverReadBackTracks(p->pSat) );
-//ABC_PRT( "time", clock() - clk );
-}
-
-        // add the clause
-        Msat_IntVecClear( p->vProj );
-        Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode1R->Num, Fraig_IsComplement(pNode1)) );
-        Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode2R->Num, Fraig_IsComplement(pNode2)) );
-        RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-        assert( RetValue );
-//        p->nSatProofImp++;
-        return 1;
-    }
-    else if ( RetValue1 == MSAT_TRUE )
-    {
-//p->time2 += clock() - clk;
-
-if ( fVerbose )
-{
-//    printf( "sat  %d  ", Msat_SolverReadBackTracks(p->pSat) );
-//ABC_PRT( "time", clock() - clk );
-}
-        // record the counter example
-//        Fraig_FeedBack( p, Msat_SolverReadModelArray(p->pSat), p->vVarsInt, pNode1R, pNode2R );
-        p->nSatCounterImp++;
-        return 0;
-    }
-    else // if ( RetValue1 == MSAT_UNKNOWN )
-    {
-p->time3 += clock() - clk;
-        p->nSatFailsImp++;
-        return 0;
-    }
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Prepares the SAT solver to run on the two nodes.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_PrepareCones( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew )
-{
-//    Msat_IntVec_t * vAdjs;
-//    int * pVars, nVars, i, k;
-    int nVarsAlloc;
-
-    assert( pOld != pNew );
-    assert( !Fraig_IsComplement(pOld) );
-    assert( !Fraig_IsComplement(pNew) );
-    // clean the variables
-    nVarsAlloc = Msat_IntVecReadSize(pMan->vVarsUsed);
-    Msat_IntVecFill( pMan->vVarsUsed, nVarsAlloc, 0 );
-    Msat_IntVecClear( pMan->vVarsInt );
-
-    pMan->nTravIds++;
-    Fraig_PrepareCones_rec( pMan, pNew );
-    Fraig_PrepareCones_rec( pMan, pOld );
-
-
-/*
-    nVars = Msat_IntVecReadSize( pMan->vVarsInt );
-    pVars = Msat_IntVecReadArray( pMan->vVarsInt );
-    for ( i = 0; i < nVars; i++ )
-    {
-        // process its connections
-        vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pVars[i] );
-        printf( "%d=%d { ", pVars[i], Msat_IntVecReadSize(vAdjs) );
-        for ( k = 0; k < Msat_IntVecReadSize(vAdjs); k++ )
-            printf( "%d ", Msat_IntVecReadEntry(vAdjs,k) );
-        printf( "}\n" );
-
-    }
-    i = 0;
-*/
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Traverses the cone, collects the numbers and adds the clauses.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_PrepareCones_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode )
-{
-    Fraig_Node_t * pFanin;
-    Msat_IntVec_t * vAdjs;
-    int fUseMuxes = 1, i;
-    int fItIsTime;
-
-    // skip if the node is aleady visited
-    assert( !Fraig_IsComplement(pNode) );
-    if ( pNode->TravId == pMan->nTravIds )
-        return;
-    pNode->TravId = pMan->nTravIds;
-
-    // collect the node's number (closer to reverse topological order)
-    Msat_IntVecPush( pMan->vVarsInt, pNode->Num );
-    Msat_IntVecWriteEntry( pMan->vVarsUsed, pNode->Num, 1 );
-    if ( !Fraig_NodeIsAnd( pNode ) )
-        return;
-
-    // if the node does not have fanins, create them
-    fItIsTime = 0;
-    if ( pNode->vFanins == NULL )
-    {
-        fItIsTime = 1;
-        // create the fanins of the supergate
-        assert( pNode->fClauses == 0 );
-        if ( fUseMuxes && Fraig_NodeIsMuxType(pNode) )
-        {
-            pNode->vFanins = Fraig_NodeVecAlloc( 4 );
-            Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p1)->p1) );
-            Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p1)->p2) );
-            Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p2)->p1) );
-            Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p2)->p2) );
-            Fraig_SupergateAddClausesMux( pMan, pNode );
-        }
-        else
-        {
-            pNode->vFanins = Fraig_CollectSupergate( pNode, fUseMuxes );
-            Fraig_SupergateAddClauses( pMan, pNode, pNode->vFanins );
-        }
-        assert( pNode->vFanins->nSize > 1 );
-        pNode->fClauses = 1;
-        pMan->nVarsClauses++;
-
-        // add fanins
-        vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pNode->Num );
-        assert( Msat_IntVecReadSize( vAdjs ) == 0 );
-        for ( i = 0; i < pNode->vFanins->nSize; i++ )
-        {
-            pFanin = Fraig_Regular(pNode->vFanins->pArray[i]);
-            Msat_IntVecPush( vAdjs, pFanin->Num );
-        }
-    }
-
-    // recursively visit the fanins
-    for ( i = 0; i < pNode->vFanins->nSize; i++ )
-        Fraig_PrepareCones_rec( pMan, Fraig_Regular(pNode->vFanins->pArray[i]) );
-
-    if ( fItIsTime )
-    {
-        // recursively visit the fanins
-        for ( i = 0; i < pNode->vFanins->nSize; i++ )
-        {
-            pFanin = Fraig_Regular(pNode->vFanins->pArray[i]);
-            vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pFanin->Num );
-            Msat_IntVecPush( vAdjs, pNode->Num );
-        }
-    }
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Collect variables using their proximity from the nodes.]
-
-  Description [This procedure creates a variable order based on collecting
-  first the nodes that are the closest to the given two target nodes.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_OrderVariables( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew )
-{
-    Fraig_Node_t * pNode, * pFanin;
-    int i, k, Number, fUseMuxes = 1;
-    int nVarsAlloc;
-
-    assert( pOld != pNew );
-    assert( !Fraig_IsComplement(pOld) );
-    assert( !Fraig_IsComplement(pNew) );
-
-    pMan->nTravIds++;
-
-    // clean the variables
-    nVarsAlloc = Msat_IntVecReadSize(pMan->vVarsUsed);
-    Msat_IntVecFill( pMan->vVarsUsed, nVarsAlloc, 0 );
-    Msat_IntVecClear( pMan->vVarsInt );
-
-    // add the first node
-    Msat_IntVecPush( pMan->vVarsInt, pOld->Num );
-    Msat_IntVecWriteEntry( pMan->vVarsUsed, pOld->Num, 1 );
-    pOld->TravId = pMan->nTravIds;
-
-    // add the second node
-    Msat_IntVecPush( pMan->vVarsInt, pNew->Num );
-    Msat_IntVecWriteEntry( pMan->vVarsUsed, pNew->Num, 1 );
-    pNew->TravId = pMan->nTravIds;
-
-    // create the variable order
-    for ( i = 0; i < Msat_IntVecReadSize(pMan->vVarsInt); i++ )
-    {
-        // get the new node on the frontier
-        Number = Msat_IntVecReadEntry(pMan->vVarsInt, i);
-        pNode = pMan->vNodes->pArray[Number];
-        if ( !Fraig_NodeIsAnd(pNode) )
-            continue;
-
-        // if the node does not have fanins, create them
-        if ( pNode->vFanins == NULL )
-        {
-            // create the fanins of the supergate
-            assert( pNode->fClauses == 0 );
-            // detecting a fanout-free cone (experiment only)
-//            Fraig_DetectFanoutFreeCone( pMan, pNode );
-
-            if ( fUseMuxes && Fraig_NodeIsMuxType(pNode) )
-            {
-                pNode->vFanins = Fraig_NodeVecAlloc( 4 );
-                Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p1)->p1) );
-                Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p1)->p2) );
-                Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p2)->p1) );
-                Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p2)->p2) );
-                Fraig_SupergateAddClausesMux( pMan, pNode );
-//                Fraig_DetectFanoutFreeConeMux( pMan, pNode );
-
-                nMuxes++;
-            }
-            else
-            {
-                pNode->vFanins = Fraig_CollectSupergate( pNode, fUseMuxes );
-                Fraig_SupergateAddClauses( pMan, pNode, pNode->vFanins );
-            }
-            assert( pNode->vFanins->nSize > 1 );
-            pNode->fClauses = 1;
-            pMan->nVarsClauses++;
-
-            pNode->fMark2 = 1; // goes together with Fraig_SetupAdjacentMark()
-        }
-
-        // explore the implication fanins of pNode
-        for ( k = 0; k < pNode->vFanins->nSize; k++ )
-        {
-            pFanin = Fraig_Regular(pNode->vFanins->pArray[k]);
-            if ( pFanin->TravId == pMan->nTravIds ) // already collected
-                continue;
-            // collect and mark
-            Msat_IntVecPush( pMan->vVarsInt, pFanin->Num );
-            Msat_IntVecWriteEntry( pMan->vVarsUsed, pFanin->Num, 1 );
-            pFanin->TravId = pMan->nTravIds;
-        }
-    }
-
-    // set up the adjacent variable information
-//    Fraig_SetupAdjacent( pMan, pMan->vVarsInt );
-    Fraig_SetupAdjacentMark( pMan, pMan->vVarsInt );
-}
-
-
-
-/**Function*************************************************************
-
-  Synopsis    [Set up the adjacent variable information.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_SetupAdjacent( Fraig_Man_t * pMan, Msat_IntVec_t * vConeVars )
-{
-    Fraig_Node_t * pNode, * pFanin;
-    Msat_IntVec_t * vAdjs;
-    int * pVars, nVars, i, k;
-
-    // clean the adjacents for the variables
-    nVars = Msat_IntVecReadSize( vConeVars );
-    pVars = Msat_IntVecReadArray( vConeVars );
-    for ( i = 0; i < nVars; i++ )
-    {
-        // process its connections
-        vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pVars[i] );
-        Msat_IntVecClear( vAdjs );
-
-        pNode = pMan->vNodes->pArray[pVars[i]];
-        if ( !Fraig_NodeIsAnd(pNode) )
-            continue;
-
-        // add fanins
-        vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pVars[i] );
-        for ( k = 0; k < pNode->vFanins->nSize; k++ )
-//        for ( k = pNode->vFanins->nSize - 1; k >= 0; k-- )
-        {
-            pFanin = Fraig_Regular(pNode->vFanins->pArray[k]);
-            Msat_IntVecPush( vAdjs, pFanin->Num );
-//            Msat_IntVecPushUniqueOrder( vAdjs, pFanin->Num );
-        }
-    }
-    // add the fanouts
-    for ( i = 0; i < nVars; i++ )
-    {
-        pNode = pMan->vNodes->pArray[pVars[i]];
-        if ( !Fraig_NodeIsAnd(pNode) )
-            continue;
-
-        // add the edges
-        for ( k = 0; k < pNode->vFanins->nSize; k++ )
-//        for ( k = pNode->vFanins->nSize - 1; k >= 0; k-- )
-        {
-            pFanin = Fraig_Regular(pNode->vFanins->pArray[k]);
-            vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pFanin->Num );
-            Msat_IntVecPush( vAdjs, pNode->Num );
-//            Msat_IntVecPushUniqueOrder( vAdjs, pFanin->Num );
-        }
-    }
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Set up the adjacent variable information.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_SetupAdjacentMark( Fraig_Man_t * pMan, Msat_IntVec_t * vConeVars )
-{
-    Fraig_Node_t * pNode, * pFanin;
-    Msat_IntVec_t * vAdjs;
-    int * pVars, nVars, i, k;
-
-    // clean the adjacents for the variables
-    nVars = Msat_IntVecReadSize( vConeVars );
-    pVars = Msat_IntVecReadArray( vConeVars );
-    for ( i = 0; i < nVars; i++ )
-    {
-        pNode = pMan->vNodes->pArray[pVars[i]];
-        if ( pNode->fMark2 == 0 )
-            continue;
-//        pNode->fMark2 = 0;
-
-        // process its connections
-//        vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pVars[i] );
-//        Msat_IntVecClear( vAdjs );
-
-        if ( !Fraig_NodeIsAnd(pNode) )
-            continue;
-
-        // add fanins
-        vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pVars[i] );
-        for ( k = 0; k < pNode->vFanins->nSize; k++ )
-//        for ( k = pNode->vFanins->nSize - 1; k >= 0; k-- )
-        {
-            pFanin = Fraig_Regular(pNode->vFanins->pArray[k]);
-            Msat_IntVecPush( vAdjs, pFanin->Num );
-//            Msat_IntVecPushUniqueOrder( vAdjs, pFanin->Num );
-        }
-    }
-    // add the fanouts
-    for ( i = 0; i < nVars; i++ )
-    {
-        pNode = pMan->vNodes->pArray[pVars[i]];
-        if ( pNode->fMark2 == 0 )
-            continue;
-        pNode->fMark2 = 0;
-
-        if ( !Fraig_NodeIsAnd(pNode) )
-            continue;
-
-        // add the edges
-        for ( k = 0; k < pNode->vFanins->nSize; k++ )
-//        for ( k = pNode->vFanins->nSize - 1; k >= 0; k-- )
-        {
-            pFanin = Fraig_Regular(pNode->vFanins->pArray[k]);
-            vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pFanin->Num );
-            Msat_IntVecPush( vAdjs, pNode->Num );
-//            Msat_IntVecPushUniqueOrder( vAdjs, pFanin->Num );
-        }
-    }
-}
-
-
-
-
-/**Function*************************************************************
-
-  Synopsis    [Adds clauses to the solver.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_SupergateAddClauses( Fraig_Man_t * p, Fraig_Node_t * pNode, Fraig_NodeVec_t * vSuper )
-{
-    int fComp1, RetValue, nVars, Var, Var1, i;
-
-    assert( Fraig_NodeIsAnd( pNode ) );
-    nVars = Msat_SolverReadVarNum(p->pSat);
-
-    Var = pNode->Num;
-    assert( Var  < nVars ); 
-    for ( i = 0; i < vSuper->nSize; i++ )
-    {
-        // get the predecessor nodes
-        // get the complemented attributes of the nodes
-        fComp1 = Fraig_IsComplement(vSuper->pArray[i]);
-        // determine the variable numbers
-        Var1 = Fraig_Regular(vSuper->pArray[i])->Num;
-        // check that the variables are in the SAT manager
-        assert( Var1 < nVars );
-
-        // suppose the AND-gate is A * B = C
-        // add !A => !C   or   A + !C
-    //  fprintf( pFile, "%d %d 0%c", Var1, -Var, 10 );
-        Msat_IntVecClear( p->vProj );
-        Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(Var1, fComp1) );
-        Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(Var,  1) );
-        RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-        assert( RetValue );
-    }
-
-    // add A & B => C   or   !A + !B + C
-//  fprintf( pFile, "%d %d %d 0%c", -Var1, -Var2, Var, 10 );
-    Msat_IntVecClear( p->vProj );
-    for ( i = 0; i < vSuper->nSize; i++ )
-    {
-        // get the predecessor nodes
-        // get the complemented attributes of the nodes
-        fComp1 = Fraig_IsComplement(vSuper->pArray[i]);
-        // determine the variable numbers
-        Var1 = Fraig_Regular(vSuper->pArray[i])->Num;
-
-        // add this variable to the array
-        Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(Var1, !fComp1) );
-    }
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(Var, 0) );
-    RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-    assert( RetValue );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Adds clauses to the solver.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_SupergateAddClausesExor( Fraig_Man_t * p, Fraig_Node_t * pNode )
-{
-    Fraig_Node_t * pNode1, * pNode2;
-    int fComp, RetValue;
-
-    assert( !Fraig_IsComplement( pNode ) );
-    assert( Fraig_NodeIsExorType( pNode ) );
-    // get nodes
-    pNode1 = Fraig_Regular(Fraig_Regular(pNode->p1)->p1);
-    pNode2 = Fraig_Regular(Fraig_Regular(pNode->p1)->p2);
-    // get the complemented attribute of the EXOR/NEXOR gate
-    fComp = Fraig_NodeIsExor( pNode ); // 1 if EXOR, 0 if NEXOR
-
-    // create four clauses
-    Msat_IntVecClear( p->vProj );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode->Num,   fComp) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode1->Num,  fComp) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode2->Num,  fComp) );
-    RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-    assert( RetValue );
-    Msat_IntVecClear( p->vProj );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode->Num,   fComp) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode1->Num, !fComp) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode2->Num, !fComp) );
-    RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-    assert( RetValue );
-    Msat_IntVecClear( p->vProj );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode->Num,  !fComp) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode1->Num,  fComp) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode2->Num, !fComp) );
-    RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-    assert( RetValue );
-    Msat_IntVecClear( p->vProj );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode->Num,  !fComp) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode1->Num, !fComp) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode2->Num,  fComp) );
-    RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-    assert( RetValue );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Adds clauses to the solver.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_SupergateAddClausesMux( Fraig_Man_t * p, Fraig_Node_t * pNode )
-{
-    Fraig_Node_t * pNodeI, * pNodeT, * pNodeE;
-    int RetValue, VarF, VarI, VarT, VarE, fCompT, fCompE;
-
-    assert( !Fraig_IsComplement( pNode ) );
-    assert( Fraig_NodeIsMuxType( pNode ) );
-    // get nodes (I = if, T = then, E = else)
-    pNodeI = Fraig_NodeRecognizeMux( pNode, &pNodeT, &pNodeE );
-    // get the variable numbers
-    VarF = pNode->Num;
-    VarI = pNodeI->Num;
-    VarT = Fraig_Regular(pNodeT)->Num;
-    VarE = Fraig_Regular(pNodeE)->Num;
-    // get the complementation flags
-    fCompT = Fraig_IsComplement(pNodeT);
-    fCompE = Fraig_IsComplement(pNodeE);
-
-    // f = ITE(i, t, e)
-
-    // i' + t' + f
-    // i' + t  + f'
-    // i  + e' + f
-    // i  + e  + f'
-
-    // create four clauses
-    Msat_IntVecClear( p->vProj );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarI,  1) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarT,  1^fCompT) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarF,  0) );
-    RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-    assert( RetValue );
-    Msat_IntVecClear( p->vProj );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarI,  1) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarT,  0^fCompT) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarF,  1) );
-    RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-    assert( RetValue );
-    Msat_IntVecClear( p->vProj );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarI,  0) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarE,  1^fCompE) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarF,  0) );
-    RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-    assert( RetValue );
-    Msat_IntVecClear( p->vProj );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarI,  0) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarE,  0^fCompE) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarF,  1) );
-    RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-    assert( RetValue );
-
-    // two additional clauses
-    // t' & e' -> f'
-    // t  & e  -> f 
-
-    // t  + e   + f'
-    // t' + e'  + f 
-
-    if ( VarT == VarE )
-    {
-//        assert( fCompT == !fCompE );
-        return;
-    }
-
-    Msat_IntVecClear( p->vProj );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarT,  0^fCompT) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarE,  0^fCompE) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarF,  1) );
-    RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-    assert( RetValue );
-    Msat_IntVecClear( p->vProj );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarT,  1^fCompT) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarE,  1^fCompE) );
-    Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarF,  0) );
-    RetValue = Msat_SolverAddClause( p->pSat, p->vProj );
-    assert( RetValue );
-
-}
-
-
-
-
-
-/**Function*************************************************************
-
-  Synopsis    [Returns the array of nodes to be combined into one multi-input AND-gate.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_DetectFanoutFreeCone_rec( Fraig_Node_t * pNode, Fraig_NodeVec_t * vSuper, Fraig_NodeVec_t * vInside, int fFirst )
-{
-    // make the pointer regular
-    pNode = Fraig_Regular(pNode);
-    // if the new node is complemented or a PI, another gate begins
-    if ( (!fFirst && pNode->nRefs > 1) || Fraig_NodeIsVar(pNode) )
-    {
-        Fraig_NodeVecPushUnique( vSuper, pNode );
-        return;
-    }
-    // go through the branches
-    Fraig_DetectFanoutFreeCone_rec( pNode->p1, vSuper, vInside, 0 );
-    Fraig_DetectFanoutFreeCone_rec( pNode->p2, vSuper, vInside, 0 );
-    // add the node
-    Fraig_NodeVecPushUnique( vInside, pNode );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns the array of nodes to be combined into one multi-input AND-gate.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-/*
-void Fraig_DetectFanoutFreeCone( Fraig_Man_t * pMan, Fraig_Node_t * pNode )
-{
-    Fraig_NodeVec_t * vFanins;
-    Fraig_NodeVec_t * vInside;
-    int nCubes;
-    extern int Fraig_CutSopCountCubes( Fraig_Man_t * pMan, Fraig_NodeVec_t * vFanins, Fraig_NodeVec_t * vInside );
-
-    vFanins = Fraig_NodeVecAlloc( 8 );
-    vInside = Fraig_NodeVecAlloc( 8 );
-
-    Fraig_DetectFanoutFreeCone_rec( pNode, vFanins, vInside, 1 );
-    assert( vInside->pArray[vInside->nSize-1] == pNode );
-
-    nCubes = Fraig_CutSopCountCubes( pMan, vFanins, vInside );
-
-printf( "%d(%d)", vFanins->nSize, nCubes );
-    Fraig_NodeVecFree( vFanins );
-    Fraig_NodeVecFree( vInside );
-}
-*/
-
-
-
-/**Function*************************************************************
-
-  Synopsis    [Returns the array of nodes to be combined into one multi-input AND-gate.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_DetectFanoutFreeConeMux_rec( Fraig_Node_t * pNode, Fraig_NodeVec_t * vSuper, Fraig_NodeVec_t * vInside, int fFirst )
-{
-    // make the pointer regular
-    pNode = Fraig_Regular(pNode);
-    // if the new node is complemented or a PI, another gate begins
-    if ( (!fFirst && pNode->nRefs > 1) || Fraig_NodeIsVar(pNode) || !Fraig_NodeIsMuxType(pNode) )
-    {
-        Fraig_NodeVecPushUnique( vSuper, pNode );
-        return;
-    }
-    // go through the branches
-    Fraig_DetectFanoutFreeConeMux_rec( Fraig_Regular(pNode->p1)->p1, vSuper, vInside, 0 );
-    Fraig_DetectFanoutFreeConeMux_rec( Fraig_Regular(pNode->p1)->p2, vSuper, vInside, 0 );
-    Fraig_DetectFanoutFreeConeMux_rec( Fraig_Regular(pNode->p2)->p1, vSuper, vInside, 0 );
-    Fraig_DetectFanoutFreeConeMux_rec( Fraig_Regular(pNode->p2)->p2, vSuper, vInside, 0 );
-    // add the node
-    Fraig_NodeVecPushUnique( vInside, pNode );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns the array of nodes to be combined into one multi-input AND-gate.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_DetectFanoutFreeConeMux( Fraig_Man_t * pMan, Fraig_Node_t * pNode )
-{
-    Fraig_NodeVec_t * vFanins;
-    Fraig_NodeVec_t * vInside;
-    int nCubes;
-    extern int Fraig_CutSopCountCubes( Fraig_Man_t * pMan, Fraig_NodeVec_t * vFanins, Fraig_NodeVec_t * vInside );
-
-    vFanins = Fraig_NodeVecAlloc( 8 );
-    vInside = Fraig_NodeVecAlloc( 8 );
-
-    Fraig_DetectFanoutFreeConeMux_rec( pNode, vFanins, vInside, 1 );
-    assert( vInside->pArray[vInside->nSize-1] == pNode );
-
-//    nCubes = Fraig_CutSopCountCubes( pMan, vFanins, vInside );
-    nCubes = 0;
-
-printf( "%d(%d)", vFanins->nSize, nCubes );
-    Fraig_NodeVecFree( vFanins );
-    Fraig_NodeVecFree( vInside );
-}
-
-
-
-/**Function*************************************************************
-
-  Synopsis    [Collect variables using their proximity from the nodes.]
-
-  Description [This procedure creates a variable order based on collecting
-  first the nodes that are the closest to the given two target nodes.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_SetActivity( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew )
-{
-    Fraig_Node_t * pNode;
-    int i, Number, MaxLevel;
-    float * pFactors = Msat_SolverReadFactors(pMan->pSat);
-    if ( pFactors == NULL )
-        return;
-    MaxLevel = ABC_MAX( pOld->Level, pNew->Level );
-    // create the variable order
-    for ( i = 0; i < Msat_IntVecReadSize(pMan->vVarsInt); i++ )
-    {
-        // get the new node on the frontier
-        Number = Msat_IntVecReadEntry(pMan->vVarsInt, i);
-        pNode = pMan->vNodes->pArray[Number];
-        pFactors[pNode->Num] = (float)pow( 0.97, MaxLevel - pNode->Level );
-//        if ( pNode->Num % 50 == 0 )
-//        printf( "(%d) %.2f  ", MaxLevel - pNode->Level, pFactors[pNode->Num] );
-    }
-//    printf( "\n" );
-}
-
-////////////////////////////////////////////////////////////////////////
-///                       END OF FILE                                ///
-////////////////////////////////////////////////////////////////////////
-
-
-ABC_NAMESPACE_IMPL_END
-
diff --git a/src/sat/fraig/fraigTable.c b/src/sat/fraig/fraigTable.c
deleted file mode 100644
index 79ab7ffc..00000000
--- a/src/sat/fraig/fraigTable.c
+++ /dev/null
@@ -1,662 +0,0 @@
-/**CFile****************************************************************
-
-  FileName    [fraigTable.c]
-
-  PackageName [FRAIG: Functionally reduced AND-INV graphs.]
-
-  Synopsis    [Structural and functional hash tables.]
-
-  Author      [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
-  
-  Affiliation [UC Berkeley]
-
-  Date        [Ver. 2.0. Started - October 1, 2004]
-
-  Revision    [$Id: fraigTable.c,v 1.7 2005/07/08 01:01:34 alanmi Exp $]
-
-***********************************************************************/
-
-#include "fraigInt.h"
-
-ABC_NAMESPACE_IMPL_START
-
-
-////////////////////////////////////////////////////////////////////////
-///                        DECLARATIONS                              ///
-////////////////////////////////////////////////////////////////////////
-
-static void Fraig_TableResizeS( Fraig_HashTable_t * p );
-static void Fraig_TableResizeF( Fraig_HashTable_t * p, int fUseSimR );
-
-////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-/**Function*************************************************************
-
-  Synopsis    [Allocates the hash table.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_HashTable_t * Fraig_HashTableCreate( int nSize )
-{
-    Fraig_HashTable_t * p;
-    // allocate the table
-    p = ABC_ALLOC( Fraig_HashTable_t, 1 );
-    memset( p, 0, sizeof(Fraig_HashTable_t) );
-    // allocate and clean the bins
-    p->nBins = Cudd_PrimeFraig(nSize);
-    p->pBins = ABC_ALLOC( Fraig_Node_t *, p->nBins );
-    memset( p->pBins, 0, sizeof(Fraig_Node_t *) * p->nBins );
-    return p;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Deallocates the supergate hash table.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_HashTableFree( Fraig_HashTable_t * p )
-{
-    ABC_FREE( p->pBins );
-    ABC_FREE( p );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Looks up an entry in the structural hash table.]
-
-  Description [If the entry with the same children does not exists, 
-  creates it, inserts it into the table, and returns 0. If the entry 
-  with the same children exists, finds it, and return 1. In both cases, 
-  the new/old entry is returned in ppNodeRes.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_HashTableLookupS( Fraig_Man_t * pMan, Fraig_Node_t * p1, Fraig_Node_t * p2, Fraig_Node_t ** ppNodeRes )
-{
-    Fraig_HashTable_t * p = pMan->pTableS;
-    Fraig_Node_t * pEnt;
-    unsigned Key;
-
-    // order the arguments
-    if ( Fraig_Regular(p1)->Num > Fraig_Regular(p2)->Num )
-        pEnt = p1, p1 = p2, p2 = pEnt;
-
-    Key = Fraig_HashKey2( p1, p2, p->nBins );
-    Fraig_TableBinForEachEntryS( p->pBins[Key], pEnt )
-        if ( pEnt->p1 == p1 && pEnt->p2 == p2 )
-        {
-            *ppNodeRes = pEnt;
-            return 1;
-        }
-    // check if it is a good time for table resizing
-    if ( p->nEntries >= 2 * p->nBins )
-    {
-        Fraig_TableResizeS( p );
-        Key = Fraig_HashKey2( p1, p2, p->nBins );
-    }
-    // create the new node
-    pEnt = Fraig_NodeCreate( pMan, p1, p2 );
-    // add the node to the corresponding linked list in the table
-    pEnt->pNextS = p->pBins[Key];
-    p->pBins[Key] = pEnt;
-    *ppNodeRes = pEnt;
-    p->nEntries++;
-    return 0;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Insert the entry in the functional hash table.]
-
-  Description [If the entry with the same key exists, return it right away.  
-  If the entry with the same key does not exists, inserts it and returns NULL. ]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_HashTableLookupF( Fraig_Man_t * pMan, Fraig_Node_t * pNode )
-{
-    Fraig_HashTable_t * p = pMan->pTableF;
-    Fraig_Node_t * pEnt, * pEntD;
-    unsigned Key;
-
-    // go through the hash table entries
-    Key = pNode->uHashR % p->nBins;
-    Fraig_TableBinForEachEntryF( p->pBins[Key], pEnt )
-    {
-        // if their simulation info differs, skip
-        if ( !Fraig_CompareSimInfo( pNode, pEnt, pMan->nWordsRand, 1 ) )
-            continue;
-        // equivalent up to the complement
-        Fraig_TableBinForEachEntryD( pEnt, pEntD )
-        {
-            // if their simulation info differs, skip
-            if ( !Fraig_CompareSimInfo( pNode, pEntD, pMan->iWordStart, 0 ) )
-                continue;
-            // found a simulation-equivalent node
-            return pEntD; 
-        }
-        // did not find a simulation equivalent node
-        // add the node to the corresponding linked list
-        pNode->pNextD = pEnt->pNextD;
-        pEnt->pNextD  = pNode;
-        // return NULL, because there is no functional equivalence in this case
-        return NULL;
-    }
-
-    // check if it is a good time for table resizing
-    if ( p->nEntries >= 2 * p->nBins )
-    {
-        Fraig_TableResizeF( p, 1 );
-        Key = pNode->uHashR % p->nBins;
-    }
-
-    // add the node to the corresponding linked list in the table
-    pNode->pNextF = p->pBins[Key];
-    p->pBins[Key] = pNode;
-    p->nEntries++;
-    // return NULL, because there is no functional equivalence in this case
-    return NULL;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Insert the entry in the functional hash table.]
-
-  Description [If the entry with the same key exists, return it right away.  
-  If the entry with the same key does not exists, inserts it and returns NULL. ]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_HashTableLookupF0( Fraig_Man_t * pMan, Fraig_Node_t * pNode )
-{
-    Fraig_HashTable_t * p = pMan->pTableF0;
-    Fraig_Node_t * pEnt;
-    unsigned Key;
-
-    // go through the hash table entries
-    Key = pNode->uHashD % p->nBins;
-    Fraig_TableBinForEachEntryF( p->pBins[Key], pEnt )
-    {
-        // if their simulation info differs, skip
-        if ( !Fraig_CompareSimInfo( pNode, pEnt, pMan->iWordStart, 0 ) )
-            continue;
-        // found a simulation-equivalent node
-        return pEnt; 
-    }
-
-    // check if it is a good time for table resizing
-    if ( p->nEntries >= 2 * p->nBins )
-    {
-        Fraig_TableResizeF( p, 0 );
-        Key = pNode->uHashD % p->nBins;
-    }
-
-    // add the node to the corresponding linked list in the table
-    pNode->pNextF = p->pBins[Key];
-    p->pBins[Key] = pNode;
-    p->nEntries++;
-    // return NULL, because there is no functional equivalence in this case
-    return NULL;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Insert the entry in the functional hash table.]
-
-  Description [Unconditionally add the node to the corresponding 
-  linked list in the table.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_HashTableInsertF0( Fraig_Man_t * pMan, Fraig_Node_t * pNode )
-{
-    Fraig_HashTable_t * p = pMan->pTableF0;
-    unsigned Key = pNode->uHashD % p->nBins;
-
-    pNode->pNextF = p->pBins[Key];
-    p->pBins[Key] = pNode;
-    p->nEntries++;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Resizes the table.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_TableResizeS( Fraig_HashTable_t * p )
-{
-    Fraig_Node_t ** pBinsNew;
-    Fraig_Node_t * pEnt, * pEnt2;
-    int nBinsNew, Counter, i, clk;
-    unsigned Key;
-
-clk = clock();
-    // get the new table size
-    nBinsNew = Cudd_PrimeFraig(2 * p->nBins); 
-    // allocate a new array
-    pBinsNew = ABC_ALLOC( Fraig_Node_t *, nBinsNew );
-    memset( pBinsNew, 0, sizeof(Fraig_Node_t *) * nBinsNew );
-    // rehash the entries from the old table
-    Counter = 0;
-    for ( i = 0; i < p->nBins; i++ )
-        Fraig_TableBinForEachEntrySafeS( p->pBins[i], pEnt, pEnt2 )
-        {
-            Key = Fraig_HashKey2( pEnt->p1, pEnt->p2, nBinsNew );
-            pEnt->pNextS = pBinsNew[Key];
-            pBinsNew[Key] = pEnt;
-            Counter++;
-        }
-    assert( Counter == p->nEntries );
-//    printf( "Increasing the structural table size from %6d to %6d. ", p->nBins, nBinsNew );
-//    ABC_PRT( "Time", clock() - clk );
-    // replace the table and the parameters
-    ABC_FREE( p->pBins );
-    p->pBins = pBinsNew;
-    p->nBins = nBinsNew;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Resizes the table.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_TableResizeF( Fraig_HashTable_t * p, int fUseSimR )
-{
-    Fraig_Node_t ** pBinsNew;
-    Fraig_Node_t * pEnt, * pEnt2;
-    int nBinsNew, Counter, i, clk;
-    unsigned Key;
-
-clk = clock();
-    // get the new table size
-    nBinsNew = Cudd_PrimeFraig(2 * p->nBins); 
-    // allocate a new array
-    pBinsNew = ABC_ALLOC( Fraig_Node_t *, nBinsNew );
-    memset( pBinsNew, 0, sizeof(Fraig_Node_t *) * nBinsNew );
-    // rehash the entries from the old table
-    Counter = 0;
-    for ( i = 0; i < p->nBins; i++ )
-        Fraig_TableBinForEachEntrySafeF( p->pBins[i], pEnt, pEnt2 )
-        {
-            if ( fUseSimR )
-                Key = pEnt->uHashR % nBinsNew;
-            else
-                Key = pEnt->uHashD % nBinsNew;
-            pEnt->pNextF = pBinsNew[Key];
-            pBinsNew[Key] = pEnt;
-            Counter++;
-        }
-    assert( Counter == p->nEntries );
-//    printf( "Increasing the functional table size from %6d to %6d. ", p->nBins, nBinsNew );
-//    ABC_PRT( "Time", clock() - clk );
-    // replace the table and the parameters
-    ABC_FREE( p->pBins );
-    p->pBins = pBinsNew;
-    p->nBins = nBinsNew;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Compares two pieces of simulation info.]
-
-  Description [Returns 1 if they are equal.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_CompareSimInfo( Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int iWordLast, int fUseRand )
-{
-    int i;
-    assert( !Fraig_IsComplement(pNode1) );
-    assert( !Fraig_IsComplement(pNode2) );
-    if ( fUseRand )
-    {
-        // if their signatures differ, skip
-        if ( pNode1->uHashR != pNode2->uHashR )
-            return 0;
-        // check the simulation info
-        for ( i = 0; i < iWordLast; i++ )
-            if ( pNode1->puSimR[i] != pNode2->puSimR[i] )
-                return 0;
-    }
-    else
-    {
-        // if their signatures differ, skip
-        if ( pNode1->uHashD != pNode2->uHashD )
-            return 0;
-        // check the simulation info
-        for ( i = 0; i < iWordLast; i++ )
-            if ( pNode1->puSimD[i] != pNode2->puSimD[i] )
-                return 0;
-    }
-    return 1;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Find the number of the different pattern.]
-
-  Description [Returns -1 if there is no such pattern]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_FindFirstDiff( Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int fCompl, int iWordLast, int fUseRand )
-{
-    int i, v;
-    assert( !Fraig_IsComplement(pNode1) );
-    assert( !Fraig_IsComplement(pNode2) );
-    // take into account possible internal complementation
-    fCompl ^= pNode1->fInv;
-    fCompl ^= pNode2->fInv;
-    // find the pattern
-    if ( fCompl )
-    {
-        if ( fUseRand )
-        {
-            for ( i = 0; i < iWordLast; i++ )
-                if ( pNode1->puSimR[i] != ~pNode2->puSimR[i] )
-                    for ( v = 0; v < 32; v++ )
-                        if ( (pNode1->puSimR[i] ^ ~pNode2->puSimR[i]) & (1 << v) )
-                            return i * 32 + v;
-        }
-        else
-        {
-            for ( i = 0; i < iWordLast; i++ )
-                if ( pNode1->puSimD[i] !=  ~pNode2->puSimD[i] )
-                    for ( v = 0; v < 32; v++ )
-                        if ( (pNode1->puSimD[i] ^ ~pNode2->puSimD[i]) & (1 << v) )
-                            return i * 32 + v;
-        }
-    }
-    else
-    {
-        if ( fUseRand )
-        {
-            for ( i = 0; i < iWordLast; i++ )
-                if ( pNode1->puSimR[i] != pNode2->puSimR[i] )
-                    for ( v = 0; v < 32; v++ )
-                        if ( (pNode1->puSimR[i] ^ pNode2->puSimR[i]) & (1 << v) )
-                            return i * 32 + v;
-        }
-        else
-        {
-            for ( i = 0; i < iWordLast; i++ )
-                if ( pNode1->puSimD[i] !=  pNode2->puSimD[i] )
-                    for ( v = 0; v < 32; v++ )
-                        if ( (pNode1->puSimD[i] ^ pNode2->puSimD[i]) & (1 << v) )
-                            return i * 32 + v;
-        }
-    }
-    return -1;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Compares two pieces of simulation info.]
-
-  Description [Returns 1 if they are equal.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_CompareSimInfoUnderMask( Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int iWordLast, int fUseRand, unsigned * puMask )
-{
-    unsigned * pSims1, * pSims2;
-    int i;
-    assert( !Fraig_IsComplement(pNode1) );
-    assert( !Fraig_IsComplement(pNode2) );
-    // get hold of simulation info
-    pSims1 = fUseRand? pNode1->puSimR : pNode1->puSimD;
-    pSims2 = fUseRand? pNode2->puSimR : pNode2->puSimD;    
-    // check the simulation info
-    for ( i = 0; i < iWordLast; i++ )
-        if ( (pSims1[i] & puMask[i]) != (pSims2[i] & puMask[i]) )
-            return 0;
-    return 1;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Compares two pieces of simulation info.]
-
-  Description [Returns 1 if they are equal.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_CollectXors( Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int iWordLast, int fUseRand, unsigned * puMask )
-{
-    unsigned * pSims1, * pSims2;
-    int i;
-    assert( !Fraig_IsComplement(pNode1) );
-    assert( !Fraig_IsComplement(pNode2) );
-    // get hold of simulation info
-    pSims1 = fUseRand? pNode1->puSimR : pNode1->puSimD;
-    pSims2 = fUseRand? pNode2->puSimR : pNode2->puSimD;    
-    // check the simulation info
-    for ( i = 0; i < iWordLast; i++ )
-        puMask[i] = ( pSims1[i] ^ pSims2[i] );
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Prints stats of the structural table.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_TablePrintStatsS( Fraig_Man_t * pMan )
-{
-    Fraig_HashTable_t * pT = pMan->pTableS;
-    Fraig_Node_t * pNode;
-    int i, Counter;
-
-    printf( "Structural table. Table size = %d. Number of entries = %d.\n", pT->nBins, pT->nEntries );
-    for ( i = 0; i < pT->nBins; i++ )
-    {
-        Counter = 0;
-        Fraig_TableBinForEachEntryS( pT->pBins[i], pNode )
-            Counter++;
-        if ( Counter > 1 )
-        {
-            printf( "%d ", Counter );
-            if ( Counter > 50 )
-                printf( "{%d} ", i );
-        }
-    }
-    printf( "\n" );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Prints stats of the structural table.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_TablePrintStatsF( Fraig_Man_t * pMan )
-{
-    Fraig_HashTable_t * pT = pMan->pTableF;
-    Fraig_Node_t * pNode;
-    int i, Counter;
-
-    printf( "Functional table. Table size = %d. Number of entries = %d.\n", pT->nBins, pT->nEntries );
-    for ( i = 0; i < pT->nBins; i++ )
-    {
-        Counter = 0;
-        Fraig_TableBinForEachEntryF( pT->pBins[i], pNode )
-            Counter++;
-        if ( Counter > 1 )
-            printf( "{%d} ", Counter );
-    }
-    printf( "\n" );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Prints stats of the structural table.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_TablePrintStatsF0( Fraig_Man_t * pMan )
-{
-    Fraig_HashTable_t * pT = pMan->pTableF0;
-    Fraig_Node_t * pNode;
-    int i, Counter;
-
-    printf( "Zero-node table. Table size = %d. Number of entries = %d.\n", pT->nBins, pT->nEntries );
-    for ( i = 0; i < pT->nBins; i++ )
-    {
-        Counter = 0;
-        Fraig_TableBinForEachEntryF( pT->pBins[i], pNode )
-            Counter++;
-        if ( Counter == 0 )
-            continue;
-/*
-        printf( "\nBin = %4d :  Number of entries = %4d\n", i, Counter );
-        Fraig_TableBinForEachEntryF( pT->pBins[i], pNode )
-            printf( "Node %5d. Hash = %10d.\n", pNode->Num, pNode->uHashD );
-*/
-    }
-    printf( "\n" );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Rehashes the table after the simulation info has changed.]
-
-  Description [Assumes that the hash values have been updated after performing
-  additional simulation. Rehashes the table using the new hash values. 
-  Uses pNextF to link the entries in the bins. Uses pNextD to link the entries 
-  with identical hash values. Returns 1 if the identical entries have been found.
-  Note that identical hash values may mean that the simulation data is different.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_TableRehashF0( Fraig_Man_t * pMan, int fLinkEquiv )
-{
-    Fraig_HashTable_t * pT = pMan->pTableF0;
-    Fraig_Node_t ** pBinsNew;
-    Fraig_Node_t * pEntF, * pEntF2, * pEnt, * pEntD2, * pEntN;
-    int ReturnValue, Counter, i;
-    unsigned Key;
-
-    // allocate a new array of bins
-    pBinsNew = ABC_ALLOC( Fraig_Node_t *, pT->nBins );
-    memset( pBinsNew, 0, sizeof(Fraig_Node_t *) * pT->nBins );
-
-    // rehash the entries in the table
-    // go through all the nodes in the F-lists (and possible in D-lists, if used)
-    Counter = 0;
-    ReturnValue = 0;
-    for ( i = 0; i < pT->nBins; i++ )
-        Fraig_TableBinForEachEntrySafeF( pT->pBins[i], pEntF, pEntF2 )
-        Fraig_TableBinForEachEntrySafeD( pEntF, pEnt, pEntD2 )
-        {
-            // decide where to put entry pEnt
-            Key = pEnt->uHashD % pT->nBins;
-            if ( fLinkEquiv )
-            {
-                // go through the entries in the new bin
-                Fraig_TableBinForEachEntryF( pBinsNew[Key], pEntN )
-                {
-                    // if they have different values skip
-                    if ( pEnt->uHashD != pEntN->uHashD )
-                        continue;
-                    // they have the same hash value, add pEnt to the D-list pEnt3
-                    pEnt->pNextD  = pEntN->pNextD;
-                    pEntN->pNextD = pEnt;
-                    ReturnValue = 1;
-                    Counter++;
-                    break;
-                }
-                if ( pEntN != NULL ) // already linked
-                    continue;
-                // we did not find equal entry
-            }
-            // link the new entry
-            pEnt->pNextF  = pBinsNew[Key];
-            pBinsNew[Key] = pEnt;
-            pEnt->pNextD  = NULL;
-            Counter++;
-        }
-    assert( Counter == pT->nEntries );
-    // replace the table and the parameters
-    ABC_FREE( pT->pBins );
-    pT->pBins = pBinsNew;
-    return ReturnValue;
-}
-
-////////////////////////////////////////////////////////////////////////
-///                       END OF FILE                                ///
-////////////////////////////////////////////////////////////////////////
-
-
-ABC_NAMESPACE_IMPL_END
-
diff --git a/src/sat/fraig/fraigUtil.c b/src/sat/fraig/fraigUtil.c
deleted file mode 100644
index 0d4cdfaf..00000000
--- a/src/sat/fraig/fraigUtil.c
+++ /dev/null
@@ -1,1039 +0,0 @@
-/**CFile****************************************************************
-
-  FileName    [fraigUtil.c]
-
-  PackageName [FRAIG: Functionally reduced AND-INV graphs.]
-
-  Synopsis    [Various utilities.]
-
-  Author      [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
-  
-  Affiliation [UC Berkeley]
-
-  Date        [Ver. 2.0. Started - October 1, 2004]
-
-  Revision    [$Id: fraigUtil.c,v 1.15 2005/07/08 01:01:34 alanmi Exp $]
-
-***********************************************************************/
-
-#include "fraigInt.h"
-#include <limits.h>
-
-ABC_NAMESPACE_IMPL_START
-
-
-////////////////////////////////////////////////////////////////////////
-///                        DECLARATIONS                              ///
-////////////////////////////////////////////////////////////////////////
-
-static int bit_count[256] = {
-  0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
-  1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
-  1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
-  2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
-  1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
-  2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
-  2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
-  3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8
-};
-
-static void Fraig_Dfs_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode, Fraig_NodeVec_t * vNodes, int fEquiv );
-static int  Fraig_CheckTfi_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode, Fraig_Node_t * pOld );
-
-////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-/**Function*************************************************************
-
-  Synopsis    [Computes the DFS ordering of the nodes.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_NodeVec_t * Fraig_Dfs( Fraig_Man_t * pMan, int fEquiv )
-{
-    Fraig_NodeVec_t * vNodes;
-    int i;
-    pMan->nTravIds++;
-    vNodes = Fraig_NodeVecAlloc( 100 );
-    for ( i = 0; i < pMan->vOutputs->nSize; i++ )
-        Fraig_Dfs_rec( pMan, Fraig_Regular(pMan->vOutputs->pArray[i]), vNodes, fEquiv );
-    return vNodes;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Computes the DFS ordering of the nodes.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_NodeVec_t * Fraig_DfsOne( Fraig_Man_t * pMan, Fraig_Node_t * pNode, int fEquiv )
-{
-    Fraig_NodeVec_t * vNodes;
-    pMan->nTravIds++;
-    vNodes = Fraig_NodeVecAlloc( 100 );
-    Fraig_Dfs_rec( pMan, Fraig_Regular(pNode), vNodes, fEquiv );
-    return vNodes;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Computes the DFS ordering of the nodes.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_NodeVec_t * Fraig_DfsNodes( Fraig_Man_t * pMan, Fraig_Node_t ** ppNodes, int nNodes, int fEquiv )
-{
-    Fraig_NodeVec_t * vNodes;
-    int i;
-    pMan->nTravIds++;
-    vNodes = Fraig_NodeVecAlloc( 100 );
-    for ( i = 0; i < nNodes; i++ )
-        Fraig_Dfs_rec( pMan, Fraig_Regular(ppNodes[i]), vNodes, fEquiv );
-    return vNodes;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Recursively computes the DFS ordering of the nodes.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_Dfs_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode, Fraig_NodeVec_t * vNodes, int fEquiv )
-{
-    assert( !Fraig_IsComplement(pNode) );
-    // skip the visited node
-    if ( pNode->TravId == pMan->nTravIds )
-        return;
-    pNode->TravId = pMan->nTravIds;
-    // visit the transitive fanin
-    if ( Fraig_NodeIsAnd(pNode) )
-    {
-        Fraig_Dfs_rec( pMan, Fraig_Regular(pNode->p1), vNodes, fEquiv );
-        Fraig_Dfs_rec( pMan, Fraig_Regular(pNode->p2), vNodes, fEquiv );
-    }
-    if ( fEquiv && pNode->pNextE )
-        Fraig_Dfs_rec( pMan, pNode->pNextE, vNodes, fEquiv );
-    // save the node
-    Fraig_NodeVecPush( vNodes, pNode );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Computes the DFS ordering of the nodes.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_CountNodes( Fraig_Man_t * pMan, int fEquiv )
-{
-    Fraig_NodeVec_t * vNodes;
-    int RetValue;
-    vNodes = Fraig_Dfs( pMan, fEquiv );
-    RetValue = vNodes->nSize;
-    Fraig_NodeVecFree( vNodes );
-    return RetValue;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns 1 if pOld is in the TFI of pNew.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_CheckTfi( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew )
-{
-    assert( !Fraig_IsComplement(pOld) );
-    assert( !Fraig_IsComplement(pNew) );
-    pMan->nTravIds++;
-    return Fraig_CheckTfi_rec( pMan, pNew, pOld );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns 1 if pOld is in the TFI of pNew.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_CheckTfi_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode, Fraig_Node_t * pOld )
-{
-    // check the trivial cases
-    if ( pNode == NULL )
-        return 0;
-    if ( pNode->Num < pOld->Num && !pMan->fChoicing )
-        return 0;
-    if ( pNode == pOld )
-        return 1;
-    // skip the visited node
-    if ( pNode->TravId == pMan->nTravIds )
-        return 0;
-    pNode->TravId = pMan->nTravIds;
-    // check the children
-    if ( Fraig_CheckTfi_rec( pMan, Fraig_Regular(pNode->p1), pOld ) )
-        return 1;
-    if ( Fraig_CheckTfi_rec( pMan, Fraig_Regular(pNode->p2), pOld ) )
-        return 1;
-    // check equivalent nodes
-    return Fraig_CheckTfi_rec( pMan, pNode->pNextE, pOld );
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Returns 1 if pOld is in the TFI of pNew.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_CheckTfi2( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew )
-{
-    Fraig_NodeVec_t * vNodes;
-    int RetValue;
-    vNodes = Fraig_DfsOne( pMan, pNew, 1 );
-    RetValue = (pOld->TravId == pMan->nTravIds);
-    Fraig_NodeVecFree( vNodes );
-    return RetValue;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Sets the number of fanouts (none, one, or many).]
-
-  Description [This procedure collects the nodes reachable from
-  the POs of the AIG and sets the type of fanout counter (none, one,
-  or many) for each node. This procedure is useful to determine
-  fanout-free cones of AND-nodes, which is helpful for rebalancing
-  the AIG (see procedure Fraig_ManRebalance, or something like that).]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_ManMarkRealFanouts( Fraig_Man_t * p )
-{
-    Fraig_NodeVec_t * vNodes;
-    Fraig_Node_t * pNodeR;
-    int i;
-    // collect the nodes reachable
-    vNodes = Fraig_Dfs( p, 0 );
-    // clean the fanouts field
-    for ( i = 0; i < vNodes->nSize; i++ )
-    {
-        vNodes->pArray[i]->nFanouts = 0;
-        vNodes->pArray[i]->pData0 = NULL;
-    }
-    // mark reachable nodes by setting the two-bit counter pNode->nFans
-    for ( i = 0; i < vNodes->nSize; i++ )
-    {
-        pNodeR = Fraig_Regular(vNodes->pArray[i]->p1);
-        if ( pNodeR && ++pNodeR->nFanouts == 3 )
-            pNodeR->nFanouts = 2;
-        pNodeR = Fraig_Regular(vNodes->pArray[i]->p2);
-        if ( pNodeR && ++pNodeR->nFanouts == 3 )
-            pNodeR->nFanouts = 2;
-    }
-    Fraig_NodeVecFree( vNodes );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Creates the constant 1 node.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_BitStringCountOnes( unsigned * pString, int nWords )
-{
-    unsigned char * pSuppBytes = (unsigned char *)pString;
-    int i, nOnes, nBytes = sizeof(unsigned) * nWords;
-    // count the number of ones in the simulation vector
-    for ( i = nOnes = 0; i < nBytes; i++ )
-        nOnes += bit_count[pSuppBytes[i]];
-    return nOnes;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Verify one useful property.]
-
-  Description [This procedure verifies one useful property. After 
-  the FRAIG construction with choice nodes is over, each primary node 
-  should have fanins that are primary nodes. The primary nodes is the 
-  one that does not have pNode->pRepr set to point to another node.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_ManCheckConsistency( Fraig_Man_t * p )
-{
-    Fraig_Node_t * pNode;
-    Fraig_NodeVec_t * pVec;
-    int i;
-    pVec = Fraig_Dfs( p, 0 );
-    for ( i = 0; i < pVec->nSize; i++ )
-    {
-        pNode = pVec->pArray[i];
-        if ( Fraig_NodeIsVar(pNode) )
-        {
-            if ( pNode->pRepr )
-                printf( "Primary input %d is a secondary node.\n", pNode->Num );
-        }
-        else if ( Fraig_NodeIsConst(pNode) )
-        {
-            if ( pNode->pRepr )
-                printf( "Constant 1 %d is a secondary node.\n", pNode->Num );
-        }
-        else
-        {
-            if ( pNode->pRepr )
-                printf( "Internal node %d is a secondary node.\n", pNode->Num );
-            if ( Fraig_Regular(pNode->p1)->pRepr )
-                printf( "Internal node %d has first fanin %d that is a secondary node.\n", 
-                    pNode->Num, Fraig_Regular(pNode->p1)->Num );
-            if ( Fraig_Regular(pNode->p2)->pRepr )
-                printf( "Internal node %d has second fanin %d that is a secondary node.\n", 
-                    pNode->Num, Fraig_Regular(pNode->p2)->Num );
-        }
-    }
-    Fraig_NodeVecFree( pVec );
-    return 1;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Prints the node.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_PrintNode( Fraig_Man_t * p, Fraig_Node_t * pNode )
-{
-    Fraig_NodeVec_t * vNodes;
-    Fraig_Node_t * pTemp;
-    int fCompl1, fCompl2, i;
-
-    vNodes = Fraig_DfsOne( p, pNode, 0 );
-    for ( i = 0; i < vNodes->nSize; i++ )
-    {
-        pTemp = vNodes->pArray[i];
-        if ( Fraig_NodeIsVar(pTemp) )
-        {
-            printf( "%3d : PI          ", pTemp->Num );
-            Fraig_PrintBinary( stdout, (unsigned *)&pTemp->puSimR, 20 );
-            printf( "   " );
-            Fraig_PrintBinary( stdout, (unsigned *)&pTemp->puSimD, 20 );
-            printf( "  %d\n", pTemp->fInv );
-            continue;
-        }
-
-        fCompl1 = Fraig_IsComplement(pTemp->p1);
-        fCompl2 = Fraig_IsComplement(pTemp->p2);
-        printf( "%3d : %c%3d %c%3d   ", pTemp->Num,
-            (fCompl1? '-':'+'), Fraig_Regular(pTemp->p1)->Num,
-            (fCompl2? '-':'+'), Fraig_Regular(pTemp->p2)->Num );
-        Fraig_PrintBinary( stdout, (unsigned *)&pTemp->puSimR, 20 );
-        printf( "   " );
-        Fraig_PrintBinary( stdout, (unsigned *)&pTemp->puSimD, 20 );
-        printf( "  %d\n", pTemp->fInv );
-    }
-    Fraig_NodeVecFree( vNodes );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Prints the bit string.]
-
-  Description []
-
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_PrintBinary( FILE * pFile, unsigned * pSign, int nBits )
-{
-    int Remainder, nWords;
-    int w, i;
-
-    Remainder = (nBits%(sizeof(unsigned)*8));
-    nWords    = (nBits/(sizeof(unsigned)*8)) + (Remainder>0);
-
-    for ( w = nWords-1; w >= 0; w-- )
-        for ( i = ((w == nWords-1 && Remainder)? Remainder-1: 31); i >= 0; i-- )
-            fprintf( pFile, "%c", '0' + (int)((pSign[w] & (1<<i)) > 0) );
-
-//  fprintf( pFile, "\n" );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Sets up the mask.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_GetMaxLevel( Fraig_Man_t * pMan )
-{
-    int nLevelMax, i;
-    nLevelMax = 0;
-    for ( i = 0; i < pMan->vOutputs->nSize; i++ )
-        nLevelMax = nLevelMax > Fraig_Regular(pMan->vOutputs->pArray[i])->Level? 
-                nLevelMax : Fraig_Regular(pMan->vOutputs->pArray[i])->Level;
-    return nLevelMax;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Analyses choice nodes.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_MappingUpdateLevel_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode, int fMaximum )
-{
-    Fraig_Node_t * pTemp;
-    int Level1, Level2, LevelE;
-    assert( !Fraig_IsComplement(pNode) );
-    if ( !Fraig_NodeIsAnd(pNode) )
-        return pNode->Level;
-    // skip the visited node
-    if ( pNode->TravId == pMan->nTravIds )
-        return pNode->Level;
-    pNode->TravId = pMan->nTravIds;
-    // compute levels of the children nodes
-    Level1 = Fraig_MappingUpdateLevel_rec( pMan, Fraig_Regular(pNode->p1), fMaximum );
-    Level2 = Fraig_MappingUpdateLevel_rec( pMan, Fraig_Regular(pNode->p2), fMaximum );
-    pNode->Level = 1 + ABC_MAX( Level1, Level2 );
-    if ( pNode->pNextE )
-    {
-        LevelE = Fraig_MappingUpdateLevel_rec( pMan, pNode->pNextE, fMaximum );
-        if ( fMaximum )
-        {
-            if ( pNode->Level < LevelE )
-                pNode->Level = LevelE;
-        }
-        else
-        {
-            if ( pNode->Level > LevelE )
-                pNode->Level = LevelE;
-        }
-        // set the level of all equivalent nodes to be the same minimum
-        if ( pNode->pRepr == NULL ) // the primary node
-            for ( pTemp = pNode->pNextE; pTemp; pTemp = pTemp->pNextE )
-                pTemp->Level = pNode->Level;
-    }
-    return pNode->Level;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Resets the levels of the nodes in the choice graph.]
-
-  Description [Makes the level of the choice nodes to be equal to the
-  maximum of the level of the nodes in the equivalence class. This way
-  sorting by level leads to the reverse topological order, which is
-  needed for the required time computation.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_MappingSetChoiceLevels( Fraig_Man_t * pMan, int fMaximum )
-{
-    int i;
-    pMan->nTravIds++;
-    for ( i = 0; i < pMan->vOutputs->nSize; i++ )
-        Fraig_MappingUpdateLevel_rec( pMan, Fraig_Regular(pMan->vOutputs->pArray[i]), fMaximum );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Reports statistics on choice nodes.]
-
-  Description [The number of choice nodes is the number of primary nodes,
-  which has pNextE set to a pointer. The number of choices is the number
-  of entries in the equivalent-node lists of the primary nodes.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_ManReportChoices( Fraig_Man_t * pMan )
-{
-    Fraig_Node_t * pNode, * pTemp;
-    int nChoiceNodes, nChoices;
-    int i, LevelMax1, LevelMax2;
-
-    // report the number of levels
-    LevelMax1 = Fraig_GetMaxLevel( pMan );
-    Fraig_MappingSetChoiceLevels( pMan, 0 );
-    LevelMax2 = Fraig_GetMaxLevel( pMan );
-
-    // report statistics about choices
-    nChoiceNodes = nChoices = 0;
-    for ( i = 0; i < pMan->vNodes->nSize; i++ )
-    {
-        pNode = pMan->vNodes->pArray[i];
-        if ( pNode->pRepr == NULL && pNode->pNextE != NULL )
-        { // this is a choice node = the primary node that has equivalent nodes
-            nChoiceNodes++;
-            for ( pTemp = pNode; pTemp; pTemp = pTemp->pNextE )
-                nChoices++;
-        }
-    }
-    printf( "Maximum level: Original = %d. Reduced due to choices = %d.\n", LevelMax1, LevelMax2 );
-    printf( "Choice stats:  Choice nodes = %d. Total choices = %d.\n", nChoiceNodes, nChoices );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns 1 if the node is the root of EXOR/NEXOR gate.]
-
-  Description [The node can be complemented.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeIsExorType( Fraig_Node_t * pNode )
-{
-    Fraig_Node_t * pNode1, * pNode2;
-    // make the node regular (it does not matter for EXOR/NEXOR)
-    pNode = Fraig_Regular(pNode);
-    // if the node or its children are not ANDs or not compl, this cannot be EXOR type
-    if ( !Fraig_NodeIsAnd(pNode) )
-        return 0;
-    if ( !Fraig_NodeIsAnd(pNode->p1) || !Fraig_IsComplement(pNode->p1) )
-        return 0;
-    if ( !Fraig_NodeIsAnd(pNode->p2) || !Fraig_IsComplement(pNode->p2) )
-        return 0;
-
-    // get children
-    pNode1 = Fraig_Regular(pNode->p1);
-    pNode2 = Fraig_Regular(pNode->p2);
-    assert( pNode1->Num < pNode2->Num );
-
-    // compare grandchildren
-    return pNode1->p1 == Fraig_Not(pNode2->p1) && pNode1->p2 == Fraig_Not(pNode2->p2);
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns 1 if the node is the root of MUX or EXOR/NEXOR.]
-
-  Description [The node can be complemented.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeIsMuxType( Fraig_Node_t * pNode )
-{
-    Fraig_Node_t * pNode1, * pNode2;
-
-    // make the node regular (it does not matter for EXOR/NEXOR)
-    pNode = Fraig_Regular(pNode);
-    // if the node or its children are not ANDs or not compl, this cannot be EXOR type
-    if ( !Fraig_NodeIsAnd(pNode) )
-        return 0;
-    if ( !Fraig_NodeIsAnd(pNode->p1) || !Fraig_IsComplement(pNode->p1) )
-        return 0;
-    if ( !Fraig_NodeIsAnd(pNode->p2) || !Fraig_IsComplement(pNode->p2) )
-        return 0;
-
-    // get children
-    pNode1 = Fraig_Regular(pNode->p1);
-    pNode2 = Fraig_Regular(pNode->p2);
-    assert( pNode1->Num < pNode2->Num );
-
-    // compare grandchildren
-    // node is an EXOR/NEXOR
-    if ( pNode1->p1 == Fraig_Not(pNode2->p1) && pNode1->p2 == Fraig_Not(pNode2->p2) )
-        return 1; 
-
-    // otherwise the node is MUX iff it has a pair of equal grandchildren
-    return pNode1->p1 == Fraig_Not(pNode2->p1) || 
-           pNode1->p1 == Fraig_Not(pNode2->p2) ||
-           pNode1->p2 == Fraig_Not(pNode2->p1) ||
-           pNode1->p2 == Fraig_Not(pNode2->p2);
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns 1 if the node is EXOR, 0 if it is NEXOR.]
-
-  Description [The node should be EXOR type and not complemented.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeIsExor( Fraig_Node_t * pNode )
-{
-    Fraig_Node_t * pNode1;
-    assert( !Fraig_IsComplement(pNode) );
-    assert( Fraig_NodeIsExorType(pNode) );
-    assert( Fraig_IsComplement(pNode->p1) );
-    // get children
-    pNode1 = Fraig_Regular(pNode->p1);
-    return Fraig_IsComplement(pNode1->p1) == Fraig_IsComplement(pNode1->p2);
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Recognizes what nodes are control and data inputs of a MUX.]
-
-  Description [If the node is a MUX, returns the control variable C.
-  Assigns nodes T and E to be the then and else variables of the MUX. 
-  Node C is never complemented. Nodes T and E can be complemented.
-  This function also recognizes EXOR/NEXOR gates as MUXes.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_NodeRecognizeMux( Fraig_Node_t * pNode, Fraig_Node_t ** ppNodeT, Fraig_Node_t ** ppNodeE )
-{
-    Fraig_Node_t * pNode1, * pNode2;
-    assert( !Fraig_IsComplement(pNode) );
-    assert( Fraig_NodeIsMuxType(pNode) );
-    // get children
-    pNode1 = Fraig_Regular(pNode->p1);
-    pNode2 = Fraig_Regular(pNode->p2);
-    // find the control variable
-    if ( pNode1->p1 == Fraig_Not(pNode2->p1) )
-    {
-        if ( Fraig_IsComplement(pNode1->p1) )
-        { // pNode2->p1 is positive phase of C
-            *ppNodeT = Fraig_Not(pNode2->p2);
-            *ppNodeE = Fraig_Not(pNode1->p2);
-            return pNode2->p1;
-        }
-        else
-        { // pNode1->p1 is positive phase of C
-            *ppNodeT = Fraig_Not(pNode1->p2);
-            *ppNodeE = Fraig_Not(pNode2->p2);
-            return pNode1->p1;
-        }
-    }
-    else if ( pNode1->p1 == Fraig_Not(pNode2->p2) )
-    {
-        if ( Fraig_IsComplement(pNode1->p1) )
-        { // pNode2->p2 is positive phase of C
-            *ppNodeT = Fraig_Not(pNode2->p1);
-            *ppNodeE = Fraig_Not(pNode1->p2);
-            return pNode2->p2;
-        }
-        else
-        { // pNode1->p1 is positive phase of C
-            *ppNodeT = Fraig_Not(pNode1->p2);
-            *ppNodeE = Fraig_Not(pNode2->p1);
-            return pNode1->p1;
-        }
-    }
-    else if ( pNode1->p2 == Fraig_Not(pNode2->p1) )
-    {
-        if ( Fraig_IsComplement(pNode1->p2) )
-        { // pNode2->p1 is positive phase of C
-            *ppNodeT = Fraig_Not(pNode2->p2);
-            *ppNodeE = Fraig_Not(pNode1->p1);
-            return pNode2->p1;
-        }
-        else
-        { // pNode1->p2 is positive phase of C
-            *ppNodeT = Fraig_Not(pNode1->p1);
-            *ppNodeE = Fraig_Not(pNode2->p2);
-            return pNode1->p2;
-        }
-    }
-    else if ( pNode1->p2 == Fraig_Not(pNode2->p2) )
-    {
-        if ( Fraig_IsComplement(pNode1->p2) )
-        { // pNode2->p2 is positive phase of C
-            *ppNodeT = Fraig_Not(pNode2->p1);
-            *ppNodeE = Fraig_Not(pNode1->p1);
-            return pNode2->p2;
-        }
-        else
-        { // pNode1->p2 is positive phase of C
-            *ppNodeT = Fraig_Not(pNode1->p1);
-            *ppNodeE = Fraig_Not(pNode2->p1);
-            return pNode1->p2;
-        }
-    }
-    assert( 0 ); // this is not MUX
-    return NULL;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Counts the number of EXOR type nodes.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_ManCountExors( Fraig_Man_t * pMan )
-{
-    int i, nExors;
-    nExors = 0;
-    for ( i = 0; i < pMan->vNodes->nSize; i++ )
-        nExors += Fraig_NodeIsExorType( pMan->vNodes->pArray[i] );
-    return nExors;
-
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Counts the number of EXOR type nodes.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_ManCountMuxes( Fraig_Man_t * pMan )
-{
-    int i, nMuxes;
-    nMuxes = 0;
-    for ( i = 0; i < pMan->vNodes->nSize; i++ )
-        nMuxes += Fraig_NodeIsMuxType( pMan->vNodes->pArray[i] );
-    return nMuxes;
-
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns 1 if siminfo of Node1 is contained in siminfo of Node2.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeSimsContained( Fraig_Man_t * pMan, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2 )
-{
-    unsigned * pUnsigned1, * pUnsigned2;
-    int i;
-
-    // compare random siminfo
-    pUnsigned1 = pNode1->puSimR;
-    pUnsigned2 = pNode2->puSimR;
-    for ( i = 0; i < pMan->nWordsRand; i++ )
-        if ( pUnsigned1[i] & ~pUnsigned2[i] )
-            return 0;
-
-    // compare systematic siminfo
-    pUnsigned1 = pNode1->puSimD;
-    pUnsigned2 = pNode2->puSimD;
-    for ( i = 0; i < pMan->iWordStart; i++ )
-        if ( pUnsigned1[i] & ~pUnsigned2[i] )
-            return 0;
-
-    return 1;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Count the number of PI variables.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_CountPis( Fraig_Man_t * p, Msat_IntVec_t * vVarNums )
-{
-    int * pVars, nVars, i, Counter;
-
-    nVars = Msat_IntVecReadSize(vVarNums);
-    pVars = Msat_IntVecReadArray(vVarNums);
-    Counter = 0;
-    for ( i = 0; i < nVars; i++ )
-        Counter += Fraig_NodeIsVar( p->vNodes->pArray[pVars[i]] );
-    return Counter;
-}
-
-
-
-/**Function*************************************************************
-
-  Synopsis    [Counts the number of EXOR type nodes.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_ManPrintRefs( Fraig_Man_t * pMan )
-{
-    Fraig_NodeVec_t * vPivots;
-    Fraig_Node_t * pNode, * pNode2;
-    int i, k, Counter, nProved;
-    int clk;
-
-    vPivots = Fraig_NodeVecAlloc( 1000 );
-    for ( i = 0; i < pMan->vNodes->nSize; i++ )
-    {
-        pNode = pMan->vNodes->pArray[i];
-
-        if ( pNode->nOnes == 0 || pNode->nOnes == (unsigned)pMan->nWordsRand * 32 )
-            continue;
-
-        if ( pNode->nRefs > 5 )
-        {
-            Fraig_NodeVecPush( vPivots, pNode );
-//            printf( "Node %6d : nRefs = %2d   Level = %3d.\n", pNode->Num, pNode->nRefs, pNode->Level );
-        }
-    }
-    printf( "Total nodes = %d. Referenced nodes = %d.\n", pMan->vNodes->nSize, vPivots->nSize );
-
-clk = clock();
-    // count implications
-    Counter = nProved = 0;
-    for ( i = 0; i < vPivots->nSize; i++ )
-        for ( k = i+1; k < vPivots->nSize; k++ )
-        {
-            pNode  = vPivots->pArray[i];
-            pNode2 = vPivots->pArray[k];
-            if ( Fraig_NodeSimsContained( pMan, pNode, pNode2 ) )
-            {
-                if ( Fraig_NodeIsImplication( pMan, pNode, pNode2, -1 ) )
-                    nProved++;
-                Counter++;
-            }
-            else if ( Fraig_NodeSimsContained( pMan, pNode2, pNode ) )
-            {
-                if ( Fraig_NodeIsImplication( pMan, pNode2, pNode, -1 ) )
-                    nProved++;
-                Counter++;
-            }
-        }
-    printf( "Number of candidate pairs = %d.  Proved = %d.\n", Counter, nProved );
-//ABC_PRT( "Time", clock() - clk );
-    return 0;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Checks if pNew exists among the implication fanins of pOld.]
-
-  Description [If pNew is an implication fanin of pOld, returns 1. 
-  If Fraig_Not(pNew) is an implication fanin of pOld, return -1.
-  Otherwise returns 0.]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeIsInSupergate( Fraig_Node_t * pOld, Fraig_Node_t * pNew )
-{
-    int RetValue1, RetValue2;
-    if ( Fraig_Regular(pOld) == Fraig_Regular(pNew) )
-        return (pOld == pNew)? 1 : -1;
-    if ( Fraig_IsComplement(pOld) || Fraig_NodeIsVar(pOld) )
-        return 0;
-    RetValue1 = Fraig_NodeIsInSupergate( pOld->p1, pNew );
-    RetValue2 = Fraig_NodeIsInSupergate( pOld->p2, pNew );
-    if ( RetValue1 == -1 || RetValue2 == -1 )
-        return -1;
-    if ( RetValue1 ==  1 || RetValue2 ==  1 )
-        return 1;
-    return 0;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    [Returns the array of nodes to be combined into one multi-input AND-gate.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_CollectSupergate_rec( Fraig_Node_t * pNode, Fraig_NodeVec_t * vSuper, int fFirst, int fStopAtMux )
-{
-    // if the new node is complemented or a PI, another gate begins
-//    if ( Fraig_IsComplement(pNode) || Fraig_NodeIsVar(pNode) || Fraig_NodeIsMuxType(pNode) )
-    if ( (!fFirst && Fraig_Regular(pNode)->nRefs > 1) || 
-          Fraig_IsComplement(pNode) || Fraig_NodeIsVar(pNode) || 
-          (fStopAtMux && Fraig_NodeIsMuxType(pNode)) )
-    {
-        Fraig_NodeVecPushUnique( vSuper, pNode );
-        return;
-    }
-    // go through the branches
-    Fraig_CollectSupergate_rec( pNode->p1, vSuper, 0, fStopAtMux );
-    Fraig_CollectSupergate_rec( pNode->p2, vSuper, 0, fStopAtMux );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Returns the array of nodes to be combined into one multi-input AND-gate.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_NodeVec_t * Fraig_CollectSupergate( Fraig_Node_t * pNode, int fStopAtMux )
-{
-    Fraig_NodeVec_t * vSuper;
-    vSuper = Fraig_NodeVecAlloc( 8 );
-    Fraig_CollectSupergate_rec( pNode, vSuper, 1, fStopAtMux );
-    return vSuper;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_ManIncrementTravId( Fraig_Man_t * pMan )
-{
-    pMan->nTravIds2++;
-}
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeSetTravIdCurrent( Fraig_Man_t * pMan, Fraig_Node_t * pNode )
-{
-    pNode->TravId2 = pMan->nTravIds2;
-}
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeIsTravIdCurrent( Fraig_Man_t * pMan, Fraig_Node_t * pNode )
-{
-    return pNode->TravId2 == pMan->nTravIds2;
-}
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeIsTravIdPrevious( Fraig_Man_t * pMan, Fraig_Node_t * pNode )
-{
-    return pNode->TravId2 == pMan->nTravIds2 - 1;
-}
-
-////////////////////////////////////////////////////////////////////////
-///                       END OF FILE                                ///
-////////////////////////////////////////////////////////////////////////
-
-
-ABC_NAMESPACE_IMPL_END
-
diff --git a/src/sat/fraig/fraigVec.c b/src/sat/fraig/fraigVec.c
deleted file mode 100644
index 25d50bf3..00000000
--- a/src/sat/fraig/fraigVec.c
+++ /dev/null
@@ -1,550 +0,0 @@
-/**CFile****************************************************************
-
-  FileName    [fraigVec.c]
-
-  PackageName [FRAIG: Functionally reduced AND-INV graphs.]
-
-  Synopsis    [Vector of FRAIG nodes.]
-
-  Author      [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
-  
-  Affiliation [UC Berkeley]
-
-  Date        [Ver. 2.0. Started - October 1, 2004]
-
-  Revision    [$Id: fraigVec.c,v 1.7 2005/07/08 01:01:34 alanmi Exp $]
-
-***********************************************************************/
-
-#include "fraigInt.h"
-
-ABC_NAMESPACE_IMPL_START
-
-
-////////////////////////////////////////////////////////////////////////
-///                        DECLARATIONS                              ///
-////////////////////////////////////////////////////////////////////////
-
-////////////////////////////////////////////////////////////////////////
-///                     FUNCTION DEFINITIONS                         ///
-////////////////////////////////////////////////////////////////////////
-
-/**Function*************************************************************
-
-  Synopsis    [Allocates a vector with the given capacity.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_NodeVec_t * Fraig_NodeVecAlloc( int nCap )
-{
-    Fraig_NodeVec_t * p;
-    p = ABC_ALLOC( Fraig_NodeVec_t, 1 );
-    if ( nCap > 0 && nCap < 8 )
-        nCap = 8;
-    p->nSize  = 0;
-    p->nCap   = nCap;
-    p->pArray = p->nCap? ABC_ALLOC( Fraig_Node_t *, p->nCap ) : NULL;
-    return p;
-}
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeVecFree( Fraig_NodeVec_t * p )
-{
-    ABC_FREE( p->pArray );
-    ABC_FREE( p );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Duplicates the integer array.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_NodeVec_t * Fraig_NodeVecDup( Fraig_NodeVec_t * pVec )
-{
-    Fraig_NodeVec_t * p;
-    p = ABC_ALLOC( Fraig_NodeVec_t, 1 );
-    p->nSize  = pVec->nSize;
-    p->nCap   = pVec->nCap;
-    p->pArray = p->nCap? ABC_ALLOC( Fraig_Node_t *, p->nCap ) : NULL;
-    memcpy( p->pArray, pVec->pArray, sizeof(Fraig_Node_t *) * pVec->nSize );
-    return p;
-}
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Node_t ** Fraig_NodeVecReadArray( Fraig_NodeVec_t * p )
-{
-    return p->pArray;
-}
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeVecReadSize( Fraig_NodeVec_t * p )
-{
-    return p->nSize;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Resizes the vector to the given capacity.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeVecGrow( Fraig_NodeVec_t * p, int nCapMin )
-{
-    if ( p->nCap >= nCapMin )
-        return;
-    p->pArray = ABC_REALLOC( Fraig_Node_t *, p->pArray, nCapMin ); 
-    p->nCap   = nCapMin;
-}
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeVecShrink( Fraig_NodeVec_t * p, int nSizeNew )
-{
-    assert( p->nSize >= nSizeNew );
-    p->nSize = nSizeNew;
-}
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeVecClear( Fraig_NodeVec_t * p )
-{
-    p->nSize = 0;
-}
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeVecPush( Fraig_NodeVec_t * p, Fraig_Node_t * Entry )
-{
-    if ( p->nSize == p->nCap )
-    {
-        if ( p->nCap < 16 )
-            Fraig_NodeVecGrow( p, 16 );
-        else
-            Fraig_NodeVecGrow( p, 2 * p->nCap );
-    }
-    p->pArray[p->nSize++] = Entry;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Add the element while ensuring uniqueness.]
-
-  Description [Returns 1 if the element was found, and 0 if it was new. ]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeVecPushUnique( Fraig_NodeVec_t * p, Fraig_Node_t * Entry )
-{
-    int i;
-    for ( i = 0; i < p->nSize; i++ )
-        if ( p->pArray[i] == Entry )
-            return 1;
-    Fraig_NodeVecPush( p, Entry );
-    return 0;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Inserts a new node in the order by arrival times.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeVecPushOrder( Fraig_NodeVec_t * p, Fraig_Node_t * pNode )
-{
-    Fraig_Node_t * pNode1, * pNode2;
-    int i;
-    Fraig_NodeVecPush( p, pNode );
-    // find the p of the node
-    for ( i = p->nSize-1; i > 0; i-- )
-    {
-        pNode1 = p->pArray[i  ];
-        pNode2 = p->pArray[i-1];
-        if ( pNode1 >= pNode2 )
-            break;
-        p->pArray[i  ] = pNode2;
-        p->pArray[i-1] = pNode1;
-    }
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Add the element while ensuring uniqueness in the order.]
-
-  Description [Returns 1 if the element was found, and 0 if it was new. ]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeVecPushUniqueOrder( Fraig_NodeVec_t * p, Fraig_Node_t * pNode )
-{
-    int i;
-    for ( i = 0; i < p->nSize; i++ )
-        if ( p->pArray[i] == pNode )
-            return 1;
-    Fraig_NodeVecPushOrder( p, pNode );
-    return 0;
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Inserts a new node in the order by arrival times.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeVecPushOrderByLevel( Fraig_NodeVec_t * p, Fraig_Node_t * pNode )
-{
-    Fraig_Node_t * pNode1, * pNode2;
-    int i;
-    Fraig_NodeVecPush( p, pNode );
-    // find the p of the node
-    for ( i = p->nSize-1; i > 0; i-- )
-    {
-        pNode1 = p->pArray[i  ];
-        pNode2 = p->pArray[i-1];
-        if ( Fraig_Regular(pNode1)->Level <= Fraig_Regular(pNode2)->Level )
-            break;
-        p->pArray[i  ] = pNode2;
-        p->pArray[i-1] = pNode1;
-    }
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Add the element while ensuring uniqueness in the order.]
-
-  Description [Returns 1 if the element was found, and 0 if it was new. ]
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeVecPushUniqueOrderByLevel( Fraig_NodeVec_t * p, Fraig_Node_t * pNode )
-{
-    int i;
-    for ( i = 0; i < p->nSize; i++ )
-        if ( p->pArray[i] == pNode )
-            return 1;
-    Fraig_NodeVecPushOrderByLevel( p, pNode );
-    return 0;
-}
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_NodeVecPop( Fraig_NodeVec_t * p )
-{
-    return p->pArray[--p->nSize];
-}
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeVecRemove( Fraig_NodeVec_t * p, Fraig_Node_t * Entry )
-{
-    int i;
-    for ( i = 0; i < p->nSize; i++ )
-        if ( p->pArray[i] == Entry )
-            break;
-    assert( i < p->nSize );
-    for ( i++; i < p->nSize; i++ )
-        p->pArray[i-1] = p->pArray[i];
-    p->nSize--;
-}
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeVecWriteEntry( Fraig_NodeVec_t * p, int i, Fraig_Node_t * Entry )
-{
-    assert( i >= 0 && i < p->nSize );
-    p->pArray[i] = Entry;
-}
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-Fraig_Node_t * Fraig_NodeVecReadEntry( Fraig_NodeVec_t * p, int i )
-{
-    assert( i >= 0 && i < p->nSize );
-    return p->pArray[i];
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Comparison procedure for two clauses.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeVecCompareLevelsIncreasing( Fraig_Node_t ** pp1, Fraig_Node_t ** pp2 )
-{
-    int Level1 = Fraig_Regular(*pp1)->Level;
-    int Level2 = Fraig_Regular(*pp2)->Level;
-    if ( Level1 < Level2 )
-        return -1;
-    if ( Level1 > Level2 )
-        return 1;
-    return 0; 
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Comparison procedure for two clauses.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeVecCompareLevelsDecreasing( Fraig_Node_t ** pp1, Fraig_Node_t ** pp2 )
-{
-    int Level1 = Fraig_Regular(*pp1)->Level;
-    int Level2 = Fraig_Regular(*pp2)->Level;
-    if ( Level1 > Level2 )
-        return -1;
-    if ( Level1 < Level2 )
-        return 1;
-    return 0; 
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Comparison procedure for two clauses.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeVecCompareNumbers( Fraig_Node_t ** pp1, Fraig_Node_t ** pp2 )
-{
-    int Num1 = Fraig_Regular(*pp1)->Num;
-    int Num2 = Fraig_Regular(*pp2)->Num;
-    if ( Num1 < Num2 )
-        return -1;
-    if ( Num1 > Num2 )
-        return 1;
-    return 0; 
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Comparison procedure for two clauses.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-int Fraig_NodeVecCompareRefCounts( Fraig_Node_t ** pp1, Fraig_Node_t ** pp2 )
-{
-    int nRefs1 = Fraig_Regular(*pp1)->nRefs;
-    int nRefs2 = Fraig_Regular(*pp2)->nRefs;
-
-    if ( nRefs1 < nRefs2 )
-        return -1;
-    if ( nRefs1 > nRefs2 )
-        return 1;
-
-    nRefs1 = Fraig_Regular(*pp1)->Level;
-    nRefs2 = Fraig_Regular(*pp2)->Level;
-
-    if ( nRefs1 < nRefs2 )
-        return -1;
-    if ( nRefs1 > nRefs2 )
-        return 1;
-    return 0; 
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Sorting the entries by their integer value.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeVecSortByLevel( Fraig_NodeVec_t * p, int fIncreasing )
-{
-    if ( fIncreasing )
-        qsort( (void *)p->pArray, p->nSize, sizeof(Fraig_Node_t *), 
-                (int (*)(const void *, const void *)) Fraig_NodeVecCompareLevelsIncreasing );
-    else 
-        qsort( (void *)p->pArray, p->nSize, sizeof(Fraig_Node_t *), 
-                (int (*)(const void *, const void *)) Fraig_NodeVecCompareLevelsDecreasing );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Sorting the entries by their integer value.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeVecSortByNumber( Fraig_NodeVec_t * p )
-{
-    qsort( (void *)p->pArray, p->nSize, sizeof(Fraig_Node_t *), 
-            (int (*)(const void *, const void *)) Fraig_NodeVecCompareNumbers );
-}
-
-/**Function*************************************************************
-
-  Synopsis    [Sorting the entries by their integer value.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-void Fraig_NodeVecSortByRefCount( Fraig_NodeVec_t * p )
-{
-    qsort( (void *)p->pArray, p->nSize, sizeof(Fraig_Node_t *), 
-            (int (*)(const void *, const void *)) Fraig_NodeVecCompareRefCounts );
-}
-
-////////////////////////////////////////////////////////////////////////
-///                       END OF FILE                                ///
-////////////////////////////////////////////////////////////////////////
-
-ABC_NAMESPACE_IMPL_END
-
diff --git a/src/sat/fraig/module.make b/src/sat/fraig/module.make
deleted file mode 100644
index cc6eb9d3..00000000
--- a/src/sat/fraig/module.make
+++ /dev/null
@@ -1,12 +0,0 @@
-SRC +=  src/sat/fraig/fraigApi.c \
-    src/sat/fraig/fraigCanon.c \
-    src/sat/fraig/fraigFanout.c \
-    src/sat/fraig/fraigFeed.c \
-    src/sat/fraig/fraigMan.c \
-    src/sat/fraig/fraigMem.c \
-    src/sat/fraig/fraigNode.c \
-    src/sat/fraig/fraigPrime.c \
-    src/sat/fraig/fraigSat.c \
-    src/sat/fraig/fraigTable.c \
-    src/sat/fraig/fraigUtil.c \
-    src/sat/fraig/fraigVec.c