proposition: Lemma compat3_compatible' clo (COM: compatible3 gf clo): compatible'3 clo.
proof: Proof. destruct COM. econstructor; [apply compat3_mon0|]. intros. split. - eapply compat3_mon0; intros; [apply PR| apply PR0]. - apply compat3_compat0. eapply compat3_mon0; intros; [apply PR| apply PR0]. Qed.
imports: Program.Basics Paco(paco3 pacotac)