a-ii aaaa aaab aaac aaai aaba aabb aabc aabi aaca aacb aacc aaci aaib aaic aaii abaa abab abac abai abax abb- abba abbb abbi abca abcb abcc abci abia abib abic acaa acab acac acai acba acca accc acci aci- acia acic aiai aiba aica aicc aiia aiib aiic aixa aixi axi- axia ba-i ba-x baaa baba babb babi bac- baca bacc baci baia baib baic baix baxi bbbb bbci bcaa bcbc bcca bccc bcci bcia biba bibb bibi bica bicc bici bixa bixi caaa caab caac caba cabi cac- caca cacc caci caia caib caic caix caxa cbac cbax cbbc cbca cbcc cbia cbxa ccaa ccab ccac ccai ccba ccbc ccca cccb cccc ccci ccic ccii ccix ccxi ciaa ciba cibc cibi cica cicc cici ciia ciii cixi cxii cxix cxxi cxxx iaaa iaac iaai iaba iaca iacc iaia ibac ibca ibia icaa icab icac icai icbc icca iccb iccc icci iiac iica iiii ixia ixxi xbai xcii xica xiii xixi xxii xxix xxxi xxxx