proposition: Lemma compat0_compatible' clo (COM: compatible0 gf clo): compatible'0 clo.
proof: Proof. destruct COM. econstructor; [apply compat0_mon0|]. intros. split. - eapply compat0_mon0; intros; [apply PR| apply PR0]. - apply compat0_compat0. eapply compat0_mon0; intros; [apply PR| apply PR0]. Qed.
imports: Program.Basics Paco(paco0 pacotac)