proposition: Lemma gpaco0_step clo r rg: gf (gpaco0 clo rg rg) <0= gpaco0 clo r rg.
proof: Proof. intros. apply gpaco0_step_gen. eapply gf_mon. apply PR. intros. eapply gpaco0_mon. apply PR0. left; apply PR1. left; apply PR1. Qed.
imports: Program.Basics Paco(paco0 pacotac)