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 used_nodes_preserved_node_OK : forall (cfg cfg' : BDDconfig) (ul : list ad) (node : ad), BDDconfig_OK cfg -> used_list_OK cfg ul -> used_node cfg ul node -> used_nodes_preserved cfg cfg' ul -> config_node_OK cfg' node.