fact: Definition xorInvB n (p q: BITS n) := xorB p (invB q).
imports: HB(structures) mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq fintype tuple zmodp div) ssrextra.tuple ssrextra.nat spec spec.properties operations mathcomp(ssralg) mathcomp(choice fintype fingroup finalg)