proposition: Lemma rev_list_ind_type : forall P : Multiset -> Type, P nil -> (forall a l, P (rev l) -> P (rev (a :: l))) -> forall l, P (rev l).
proof: Proof. induction l; auto. Defined.
imports: Coq(Permutation PermutSetoid Lia Multiset) CoLoR(LogicUtil RelExtras MultisetCore ListExtras)