proposition: Lemma andBB n : idempotent (andB (n:=n)).
proof: Proof. by apply lift_idempotent; do !elim. Qed.
imports: HB(structures) mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq fintype tuple zmodp div) ssrextra.tuple ssrextra.nat spec spec.properties operations