diff --git a/src/aig/gia/giaDup.c b/src/aig/gia/giaDup.c
index 84ed665f0..0c0fd3d1e 100644
--- a/src/aig/gia/giaDup.c
+++ b/src/aig/gia/giaDup.c
@@ -656,6 +656,40 @@ Gia_Man_t * Gia_ManDupFlip( Gia_Man_t * p, int * pInitState )
     return pNew;
 }
 
+/**Function*************************************************************
+
+  Synopsis    [Complements some flops without duplicating AIG.]
+
+  Description [The array of integers containing the initial state
+  of each flop in the AIG.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Gia_ManFlipInit1( Gia_Man_t * p, Vec_Int_t * vInit )
+{
+    Gia_Obj_t * pObj; int c;
+    assert( Gia_ManRegNum(p) == Vec_IntSize(vInit) );
+    Gia_ManForEachRo( p, pObj, c )
+        pObj->fMark0 = (int)(Vec_IntEntry(vInit, c) == 1);
+    Gia_ManForEachAnd( p, pObj, c ) {
+        if ( Gia_ObjFanin0(pObj)->fMark0 )
+            pObj->fCompl0 ^= 1;
+        if ( Gia_ObjFanin1(pObj)->fMark0 )
+            pObj->fCompl1 ^= 1;
+    }
+    Gia_ManForEachCo( p, pObj, c )
+        if ( Gia_ObjFanin0(pObj)->fMark0 )
+            pObj->fCompl0 ^= 1;
+    Gia_ManForEachRo( p, pObj, c )
+        pObj->fMark0 = 0;
+    Gia_ManForEachRi( p, pObj, c )
+        if ( Vec_IntEntry(vInit, c) == 1 )
+            pObj->fCompl0 ^= 1;
+}
+
 
 /**Function*************************************************************
 
diff --git a/src/base/abci/abc.c b/src/base/abci/abc.c
index 73c723a90..bba7b3bcf 100644
--- a/src/base/abci/abc.c
+++ b/src/base/abci/abc.c
@@ -635,6 +635,7 @@ static int Abc_CommandAbc9Gen                ( Abc_Frame_t * pAbc, int argc, cha
 static int Abc_CommandAbc9Cfs                ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandAbc9ProdAdd            ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandAbc9AddFlop            ( Abc_Frame_t * pAbc, int argc, char ** argv );
+static int Abc_CommandAbc9Init1              ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandAbc9BMiter             ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandAbc9GenHie             ( Abc_Frame_t * pAbc, int argc, char ** argv );
 static int Abc_CommandAbc9PutOnTop           ( Abc_Frame_t * pAbc, int argc, char ** argv );
@@ -1477,6 +1478,7 @@ void Abc_Init( Abc_Frame_t * pAbc )
     Cmd_CommandAdd( pAbc, "ABC9",         "&cfs",          Abc_CommandAbc9Cfs,                    0 );
     Cmd_CommandAdd( pAbc, "ABC9",         "&prodadd",      Abc_CommandAbc9ProdAdd,                0 );
     Cmd_CommandAdd( pAbc, "ABC9",         "&addflop",      Abc_CommandAbc9AddFlop,                0 );    
+    Cmd_CommandAdd( pAbc, "ABC9",         "&init1",        Abc_CommandAbc9Init1,                  0 );    
     Cmd_CommandAdd( pAbc, "ABC9",         "&bmiter",       Abc_CommandAbc9BMiter,                 0 );    
     Cmd_CommandAdd( pAbc, "ABC9",         "&gen_hie",      Abc_CommandAbc9GenHie,                 0 );    
     Cmd_CommandAdd( pAbc, "ABC9",         "&putontop",     Abc_CommandAbc9PutOnTop,               0 );    
@@ -57029,6 +57031,59 @@ usage:
     return 1;
 }
 
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Abc_CommandAbc9Init1( Abc_Frame_t * pAbc, int argc, char ** argv )
+{
+    extern void Gia_ManFlipInit1( Gia_Man_t * p, Vec_Int_t * vInit );
+    int c, fVerbose = 0;
+    Extra_UtilGetoptReset();
+    while ( ( c = Extra_UtilGetopt( argc, argv, "vh" ) ) != EOF )
+    {
+        switch ( c )
+        {
+        case 'v':
+            fVerbose ^= 1;
+            break;
+        case 'h':
+            goto usage;
+        default:
+            goto usage;
+        }
+    }
+    if ( pAbc->pGia == NULL ) {
+        Abc_Print( -1, "Abc_CommandAbc9Init1(): There is no AIG.\n" );
+        return 0;
+    }
+    if ( Gia_ManRegNum(pAbc->pGia) == 0 )  {
+        Abc_Print( -1, "Abc_CommandAbc9Init1(): There is no flops.\n" );
+        return 0;
+    }
+    if ( pAbc->pGia->vRegInits == NULL ) {
+        Abc_Print( -1, "Abc_CommandAbc9Init1(): Flop init states are not available.\n" );
+        return 0;
+    }
+    Gia_ManFlipInit1( pAbc->pGia, pAbc->pGia->vRegInits );
+    return 0;
+
+usage:
+    Abc_Print( -2, "usage: &init1 [-vh]\n" );
+    Abc_Print( -2, "\t         complements the inputs/outputs of flops with const-1 initial state\n" );
+    Abc_Print( -2, "\t-v     : toggles printing verbose information [default = %s]\n",  fVerbose? "yes": "no" );
+    Abc_Print( -2, "\t-h     : print the command usage\n");
+    return 1;
+}
+
+
 /**Function*************************************************************
 
   Synopsis    []