proposition: Lemma gpaco12_step clo r rg: gf (gpaco12 clo rg rg) <12= gpaco12 clo r rg.
proof: Proof. intros. apply gpaco12_step_gen. eapply gf_mon. apply PR. intros. eapply gpaco12_mon. apply PR0. left; apply PR1. left; apply PR1. Qed.
imports: Program.Basics Paco(paco12 pacotac)