proposition: Lemma ZOOOPST_singleton_nil : forall A B C h, @zero_or_one_outputs_per_step_trace A B C [(h, inr [])].
proof: Proof. Proof using. unfold zero_or_one_outputs_per_step_trace, zero_or_one_outputs_per_step. simpl in *. intuition. subst. simpl in *. find_inversion. auto. Qed.
imports: Verdi(Verdi HandlerMonad)