proposition: Lemma gpaco12_step_gen clo r rg: gf (gpaco12 clo (rg \12/ r) (rg \12/ r)) <12= gpaco12 clo r rg.
proof: Proof. intros. econstructor. apply rclo12_base. left. pstep. eapply gf_mon. apply PR. intros. destruct PR0. eapply rclo12_mon. apply IN. intros. destruct PR0. - left. eapply paco12_mon. apply H. intros. destruct PR0; apply H0. - right. apply H. Qed.
imports: Program.Basics Paco(paco12 pacotac)