proposition: Lemma gpaco5_step clo r rg: gf (gpaco5 clo rg rg) <5= gpaco5 clo r rg.
proof: Proof. intros. apply gpaco5_step_gen. eapply gf_mon. apply PR. intros. eapply gpaco5_mon. apply PR0. left; apply PR1. left; apply PR1. Qed.
imports: Program.Basics Paco(paco5 pacotac)