proposition: Lemma Forall2_swap_inv : forall P r s, Forall2 (fun b a => P a b) s r -> Forall2 P r s.
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)