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diff --git a/src/aig/gia/giaSolver_cnf.c b/src/aig/gia/giaSolver_cnf.c
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+++ b/src/aig/gia/giaSolver_cnf.c
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+/**CFile****************************************************************
+
+  FileName    [giaSolver.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Scalable AIG package.]
+
+  Synopsis    [Circuit-based SAT solver.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: giaSolver.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "gia.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Sat_Cla_t_ Sat_Cla_t;
+struct Sat_Cla_t_
+{
+    unsigned       hWatch0;          // watched list for 0 literal
+    unsigned       hWatch1;          // watched list for 1 literal
+    int            Activity;         // activity of the clause
+    int            nLits;            // the number of literals
+    int            pLits[0];         // the array of literals  
+};
+
+typedef struct Sat_Fan_t_ Sat_Fan_t;
+struct Sat_Fan_t_
+{
+    unsigned       iFan      : 31;   // ID of the fanin/fanout
+    unsigned       fCompl    :  1;   // complemented attribute
+};
+
+typedef struct Sat_Obj_t_ Sat_Obj_t;
+struct Sat_Obj_t_
+{
+    unsigned       hHandle;          // node handle
+    unsigned       fAssign   :  1;   // terminal node (CI/CO)
+    unsigned       fValue    :  1;   // value under 000 pattern
+    unsigned       fMark0    :  1;   // first user-controlled mark
+    unsigned       fMark1    :  1;   // second user-controlled mark
+    unsigned       nFanouuts : 28;   // the number of fanouts
+    unsigned       nFanins   :  8;   // the number of fanins
+    unsigned       Level     : 24;   // logic level
+    unsigned       hNext;            // next one on this level 
+    unsigned       hWatch0;          // watched list for 0 literal
+    unsigned       hWatch1;          // watched list for 1 literal
+    unsigned       hReason;          // reason for this variable
+    unsigned       Depth;            // decision depth
+    Sat_Fan_t      Fanios[0];        // the array of fanins/fanouts
+};
+
+typedef struct Sat_Man_t_ Sat_Man_t;
+struct Sat_Man_t_
+{
+    Gia_Man_t *    pGia;             // the original AIG manager
+    // circuit
+    Vec_Int_t      vCis;             // the vector of CIs (PIs + LOs)
+    Vec_Int_t      vObjs;            // the vector of objects
+    // learned clauses         
+    Vec_Int_t      vClauses;         // the vector of clauses
+    // solver data
+    Vec_Int_t      vTrail;           // variable queue               
+    Vec_Int_t      vTrailLim;        // pointer into the trail               
+    int            iHead;            // variable queue 
+    int            iTail;            // variable queue
+    int            iRootLevel;       // first decision
+    // levelized order
+    int            iLevelTop;        // the largest unassigned level 
+    Vec_Int_t      vLevels;          // the linked lists of levels
+};
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+