Notation getl := (getLocal).Notation gets := (getStatelet).Notation getp := (@getProtocol w).(* Getters for transitions *)

Definition get_coh l := @coh (getp l).Definition get_st l := @snd_trans (getp l).Definition get_rt l := @rcv_trans (getp l).

Lemma step_preserves_labels s1 s2 : network_step s1 s2 -> dom s1 =i dom s2.