proposition: Lemma compat2_compatible' clo (COM: compatible2 gf clo): compatible'2 clo.
proof: Proof. destruct COM. econstructor; [apply compat2_mon0|]. intros. split. - eapply compat2_mon0; intros; [apply PR| apply PR0]. - apply compat2_compat0. eapply compat2_mon0; intros; [apply PR| apply PR0]. Qed.
imports: Program.Basics Paco(paco2 pacotac)