proposition: Lemma gpaco9_gen_guard clo r rg: gpaco9 clo r (rg \9/ r) <9= gpaco9 clo r rg.
proof: Proof. intros. destruct PR. econstructor. eapply rclo9_mon. apply IN. intros. destruct PR; [|right; apply H]. left. eapply paco9_mon_gen; intros. apply H. apply PR. destruct PR. apply H0. right. apply H0. Qed.
imports: Program.Basics Paco(paco9 pacotac)