proposition: Lemma Forall2_swap : forall P r s, Forall2 P r s -> Forall2 (fun b a => P a b) s r.
proof: Proof. Proof using. introv F. induction~ F. Qed.
imports: Coq.Classes.Morphisms TLC(LibTactics LibLogic LibReflect LibOperation LibProd LibOption LibNat LibInt LibWf LibMonoid LibRelation)