proposition: Lemma gpaco9_step clo r rg: gf (gpaco9 clo rg rg) <9= gpaco9 clo r rg.
proof: Proof. intros. apply gpaco9_step_gen. eapply gf_mon. apply PR. intros. eapply gpaco9_mon. apply PR0. left; apply PR1. left; apply PR1. Qed.
imports: Program.Basics Paco(paco9 pacotac)