proposition: Lemma gpaco8_step clo r rg: gf (gpaco8 clo rg rg) <8= gpaco8 clo r rg.
proof: Proof. intros. apply gpaco8_step_gen. eapply gf_mon. apply PR. intros. eapply gpaco8_mon. apply PR0. left; apply PR1. left; apply PR1. Qed.
imports: Program.Basics Paco(paco8 pacotac)