proposition: Lemma gpaco12_unfold_bot clo (WCMP: wcompatible12 gf clo): gpaco12 gf clo bot12 bot12 <12= gf (gpaco12 gf clo bot12 bot12).
proof: Proof. intros. apply gpaco12_init in PR; [|apply WCMP]. _punfold PR; [..|apply gf_mon]. eapply gf_mon. apply PR. intros. destruct PR0; [|contradiction]. apply gpaco12_final. apply gf_mon. right. apply H. Qed.
imports: Program.Basics Paco(paco12 pacotac)