proposition: Lemma envSubst_transp_lower : forall S, envSubst_transp (envSubst_lower S) <=> envSubst_lower (envSubst_transp S).
proof: Proof. intros; constructor; destruct S; fo. Qed.
imports: CoLoR(RelExtras ListPermutation TermsPos ListUtil ListExtras LogicUtil) Coq(Compare_dec Setoid Morphisms Lia PeanoNat)