Definition rec_copy1_trans (c : Config) (s1 s2 : Site) :=
  mkconfig (S (time c)) (dt c) (st c) (rt c)
    (Post_message dec (Collect_message (bm c) s1 s2) s2 s1).

Lemma rcop1_trans_diff_site : forall s3 s4 : Site, (In_queue Message copy (bm c0 s3 s4) -> s3 <> s4) -> In_queue Message copy (bm (rec_copy1_trans c0 s1 s2) s3 s4) -> s3 <> s4.