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diff --git a/src/aig/gia/giaSupMin.c b/src/aig/gia/giaSupMin.c
new file mode 100644
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+/**CFile****************************************************************
+
+  FileName    [giaSupMin.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Scalable AIG package.]
+
+  Synopsis    [Support minimization for AIGs with don't-cares.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: giaSupMin.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "gia.h"
+#include "kit.h"
+
+ABC_NAMESPACE_IMPL_START
+
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// decomposition manager
+typedef struct Gia_ManSup_t_ Gia_ManSup_t;
+struct Gia_ManSup_t_ 
+{
+    int             nVarsMax;     // the max number of variables
+    int             nWordsMax;    // the max number of words
+    Vec_Ptr_t *     vTruthVars;   // elementary truth tables
+    Vec_Ptr_t *     vTruthNodes;  // internal truth tables
+    // current problem
+    Gia_Man_t *     pGia;
+    int             iData;
+    int             iCare;
+    Vec_Int_t *     vConeCare;
+    Vec_Int_t *     vConeData;
+    unsigned *      pTruthIn;
+    unsigned *      pTruthOut;
+};
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts Decmetry manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Gia_ManSup_t * Gia_ManSupStart( int nVarsMax )
+{
+    Gia_ManSup_t * p;
+    assert( nVarsMax <= 20 );
+    p = ABC_CALLOC( Gia_ManSup_t, 1 );
+    p->nVarsMax    = nVarsMax;
+    p->nWordsMax   = Kit_TruthWordNum( p->nVarsMax );
+    p->vTruthVars  = Vec_PtrAllocTruthTables( p->nVarsMax );
+    p->vTruthNodes = Vec_PtrAllocSimInfo( 512, p->nWordsMax );
+    p->vConeCare   = Vec_IntAlloc( 512 );
+    p->vConeData   = Vec_IntAlloc( 512 );
+    p->pTruthIn    = ABC_ALLOC( unsigned, p->nWordsMax );
+    p->pTruthOut   = ABC_ALLOC( unsigned, p->nWordsMax );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops Decmetry manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Gia_ManSupStop( Gia_ManSup_t * p )
+{
+    ABC_FREE( p->pTruthIn );
+    ABC_FREE( p->pTruthOut );
+    Vec_IntFreeP( &p->vConeCare );
+    Vec_IntFreeP( &p->vConeData );
+    Vec_PtrFreeP( &p->vTruthVars );
+    Vec_PtrFreeP( &p->vTruthNodes );
+    ABC_FREE( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Gia_ManSupExperimentOne( Gia_ManSup_t * p, Gia_Obj_t * pData, Gia_Obj_t * pCare )
+{
+    int iData = Gia_ObjId( p->pGia, Gia_Regular(pData) );
+    int iCare = Gia_ObjId( p->pGia, Gia_Regular(pCare) );
+    if ( !Gia_ObjIsAnd(Gia_Regular(pCare)) )
+    {
+        Abc_Print( 1, "Enable is not an AND.\n" );
+        return;
+    }
+    Abc_Print( 1, "DataSupp = %6d. DataCone = %6d.   CareSupp = %6d. CareCone = %6d.", 
+        Gia_ManSuppSize( p->pGia, &iData, 1 ),
+        Gia_ManConeSize( p->pGia, &iData, 1 ),
+        Gia_ManSuppSize( p->pGia, &iCare, 1 ),
+        Gia_ManConeSize( p->pGia, &iCare, 1 ) );
+    Abc_Print( 1, "\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Gia_ManSupExperiment( Gia_Man_t * pGia, Vec_Int_t * vPairs )
+{
+    Gia_ManSup_t * p;
+    Gia_Obj_t * pData, * pCare;
+    int i;
+    p = Gia_ManSupStart( 16 );
+    p->pGia = pGia;
+    assert( Vec_IntSize(vPairs) % 2 == 0 );
+    for ( i = 0; i < Vec_IntSize(vPairs)/2; i++ )
+    {
+        Abc_Print( 1, "%6d : ", i );
+        pData = Gia_ManPo( pGia, Vec_IntEntry(vPairs, 2*i+0) );
+        pCare = Gia_ManPo( pGia, Vec_IntEntry(vPairs, 2*i+1) );
+        Gia_ManSupExperimentOne( p, Gia_ObjChild0(pData), Gia_ObjChild0(pCare) );
+    }
+    Gia_ManSupStop( p );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+