proposition: Lemma gpaco5_step_gen clo r rg: gf (gpaco5 clo (rg \5/ r) (rg \5/ r)) <5= gpaco5 clo r rg.
proof: Proof. intros. econstructor. apply rclo5_base. left. pstep. eapply gf_mon. apply PR. intros. destruct PR0. eapply rclo5_mon. apply IN. intros. destruct PR0. - left. eapply paco5_mon. apply H. intros. destruct PR0; apply H0. - right. apply H. Qed.
imports: Program.Basics Paco(paco5 pacotac)