(** Def 5 of (Rose) *)

Definition Mod2_e : Cobham :=
  Rec
    Zero
    (False_e 2)
    (One_e 2)
    (One_e 1).

Lemma PlusOneMinusMod2_length : forall l, length (Sem PlusOneMinusMod2_e l) <= S (length (hd nil l)).