proposition: Lemma noduplicates_remove_duplicates : forall l, noduplicates (remove_duplicates l).
proof: Proof. Proof using. introv. forwards*: remove_duplicates_spec l. Qed.
imports: Coq.Classes.Morphisms TLC(LibTactics LibLogic LibReflect LibOperation LibProd LibOption LibNat LibInt LibWf LibMonoid LibRelation)