proposition: Lemma gpaco12_gen_guard clo r rg: gpaco12 clo r (rg \12/ r) <12= gpaco12 clo r rg.
proof: Proof. intros. destruct PR. econstructor. eapply rclo12_mon. apply IN. intros. destruct PR; [|right; apply H]. left. eapply paco12_mon_gen; intros. apply H. apply PR. destruct PR. apply H0. right. apply H0. Qed.
imports: Program.Basics Paco(paco12 pacotac)