Opaque Length_e.
(** Def 7 of (Rose) *)
Definition MultOneMinus'_e : Cobham :=
Comp 2 Cond [
Proj 2 1;
Proj 2 0;
Zero_e 2;
Zero_e 2
].

Lemma arity_MultOneMinus' : arity MultOneMinus'_e = ok_arity 2.