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_low : forall bs : BDDstate, BDDstate_OK bs -> forall (x : BDDvar) (l r node : ad), MapGet _ bs node = Some (x, (l, r)) -> bool_fun_independent (bool_fun_of_BDD_bs bs l) x.