proposition: Lemma gpaco4_final clo r rg: (r \4/ paco4 gf rg) <4= gpaco4 clo r rg.
proof: Proof. intros. destruct PR. apply gpaco4_base, H. econstructor. apply rclo4_base. left. eapply paco4_mon_gen. apply H. - intros. eapply gf_mon. apply PR. intros. apply rclo4_base. apply PR0. - intros. left. apply PR. Qed.
imports: Program.Basics Paco(paco4 pacotac)