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 reachable_node_OK_1 : forall (bs : BDDstate) (n : nat) (node1 node2 : ad), BDDstate_OK bs -> n = nat_of_N (bs_node_height bs node1) -> node_OK bs node1 -> nodes_reachable bs node1 node2 -> node_OK bs node2.