proposition: Lemma gpaco13_gen_rclo clo r rg: gpaco13 (rclo13 clo) r rg <13= gpaco13 clo r rg.
proof: Proof. intros. destruct PR. econstructor. apply rclo13_compose. eapply rclo13_mon. apply IN. intros. destruct PR; [|right; apply H]. left. eapply paco13_mon_gen; intros; [apply H| |apply PR]. eapply gf_mon, rclo13_compose. apply PR. Qed.
imports: Program.Basics Paco(paco13 pacotac)