def AP.spzz
import bend-osdev-array@0.1.0.1/PROOF.bend as PROOFimport Base
350def AP.spzz(n: Nat) -> {Word.shl.put(n, False{}, Word.zero(n)) == Word.zero(n) : Word(n)}:
351 match n:
352 case 0n:
353 {==}
354 case 1n+ +q:
355 AP.wcon_cong(q, False{}, Word.shl.put(q, False{}, Word.zero(q)), Word.zero(q), AP.spzz(q))