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-rw-r--r--src/aig/fra/fraClass.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/aig/fra/fraClass.c b/src/aig/fra/fraClass.c
index baae7c3f..498ea758 100644
--- a/src/aig/fra/fraClass.c
+++ b/src/aig/fra/fraClass.c
@@ -801,6 +801,7 @@ Aig_Man_t * Fra_ClassesDeriveAig( Fra_Cla_t * p, int nFramesK )
// start the fraig package
pManFraig = Aig_ManStart( Aig_ManObjNumMax(p->pAig) * nFramesAll );
pManFraig->pName = Aig_UtilStrsav( p->pAig->pName );
+ pManFraig->pSpec = Aig_UtilStrsav( p->pAig->pSpec );
// allocate place for the node mapping
ppEquivs = ALLOC( Aig_Obj_t *, Aig_ManObjNumMax(p->pAig) );
Fra_ObjSetEqu( ppEquivs, Aig_ManConst1(p->pAig), Aig_ManConst1(pManFraig) );