proposition: Lemma Forall2_last : forall P r s x y, Forall2 P r s -> P x y -> Forall2 P (r & x) (s & y).
proof: Proof. Proof using. intros. apply~ Forall2_app. Qed.
imports: Coq.Classes.Morphisms TLC(LibTactics LibLogic LibReflect LibOperation LibProd LibOption LibNat LibInt LibWf LibMonoid LibRelation)