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 BDDvar_independent_bs : forall bs : BDDstate, BDDstate_OK bs -> forall (node : ad) (x : BDDvar), node_OK bs node -> Nleb (bs_node_height bs node) x = true -> bool_fun_independent (bool_fun_of_BDD_bs bs node) x.