proposition: Lemma gpaco5_unfold_bot clo (WCMP: wcompatible5 gf clo): gpaco5 gf clo bot5 bot5 <5= gf (gpaco5 gf clo bot5 bot5).
proof: Proof. intros. apply gpaco5_init in PR; [|apply WCMP]. _punfold PR; [..|apply gf_mon]. eapply gf_mon. apply PR. intros. destruct PR0; [|contradiction]. apply gpaco5_final. apply gf_mon. right. apply H. Qed.
imports: Program.Basics Paco(paco5 pacotac)