proposition: Lemma orBA n : associative (orB (n:=n)).
proof: Proof. by apply lift_associative; 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