w E w is the unary notation for a natural number that is a multiple of 73 c) {we {a, b)" : #a(w) > 2.th(w)} d) Let G = {S SS, S aSa, S bSb, S bsa, S ab, S } w E w is the unary notation for a natural number that is a multiple of 73 c) {we {a, b)" : #a(w) > 2.th(w)} d) Let G = {S SS, S aSa, S bSb, S bsa, S ab, S }