proposition: Lemma gpaco4_unfold_bot clo (WCMP: wcompatible4 gf clo): gpaco4 gf clo bot4 bot4 <4= gf (gpaco4 gf clo bot4 bot4).
proof: Proof. intros. apply gpaco4_init in PR; [|apply WCMP]. _punfold PR; [..|apply gf_mon]. eapply gf_mon. apply PR. intros. destruct PR0; [|contradiction]. apply gpaco4_final. apply gf_mon. right. apply H. Qed.
imports: Program.Basics Paco(paco4 pacotac)