Definition Succ : term := .\"n","z","s"; "s" "n".
Hint Unfold Zero Succ : cbv.

(* Specifications: *)
Lemma Succ_correct n : Succ (enc n) ≻* enc (S n).
Definition Add  := Eval cbn in rho (.\ "a", "n", "m"; "n" "m" (.\"n"; !Succ ("a" "n" "m"))).