Definition bs_of_cfg := fst cfg.Definition share_of_cfg := fst (snd cfg).Definition fl_of_cfg := fst (snd (snd cfg)).Definition cnt_of_cfg := fst (snd (snd (snd cfg))).Definition negm_of_cfg := fst (snd (snd (snd (snd cfg)))).Definition orm_of_cfg := fst (snd (snd (snd (snd (snd cfg))))).Definition um_of_cfg := snd (snd (snd (snd (snd (snd cfg))))).

Lemma node_preserved_bs_trans : forall (bs1 bs2 bs3 : BDDstate) (node : ad), BDDstate_OK bs1 -> node_preserved_bs bs1 bs2 node -> node_preserved_bs bs2 bs3 node -> node_preserved_bs bs1 bs3 node.