proposition: Lemma gpaco12_gen_rclo clo r rg: gpaco12 (rclo12 clo) r rg <12= gpaco12 clo r rg.
proof: Proof. intros. destruct PR. econstructor. apply rclo12_compose. eapply rclo12_mon. apply IN. intros. destruct PR; [|right; apply H]. left. eapply paco12_mon_gen; intros; [apply H| |apply PR]. eapply gf_mon, rclo12_compose. apply PR. Qed.
imports: Program.Basics Paco(paco12 pacotac)