proposition: Lemma gpaco5_gen_guard clo r rg: gpaco5 clo r (rg \5/ r) <5= gpaco5 clo r rg.
proof: Proof. intros. destruct PR. econstructor. eapply rclo5_mon. apply IN. intros. destruct PR; [|right; apply H]. left. eapply paco5_mon_gen; intros. apply H. apply PR. destruct PR. apply H0. right. apply H0. Qed.
imports: Program.Basics Paco(paco5 pacotac)