proposition: Lemma gpaco4_gen_rclo clo r rg: gpaco4 (rclo4 clo) r rg <4= gpaco4 clo r rg.
proof: Proof. intros. destruct PR. econstructor. apply rclo4_compose. eapply rclo4_mon. apply IN. intros. destruct PR; [|right; apply H]. left. eapply paco4_mon_gen; intros; [apply H| |apply PR]. eapply gf_mon, rclo4_compose. apply PR. Qed.
imports: Program.Basics Paco(paco4 pacotac)