proposition: Lemma compat4_compatible' clo (COM: compatible4 gf clo): compatible'4 clo.
proof: Proof. destruct COM. econstructor; [apply compat4_mon0|]. intros. split. - eapply compat4_mon0; intros; [apply PR| apply PR0]. - apply compat4_compat0. eapply compat4_mon0; intros; [apply PR| apply PR0]. Qed.
imports: Program.Basics Paco(paco4 pacotac)