a-ii aaaa aaab aaac aaai aaba aabb aabc aabi aaca aacb aacc aaci aaco aaib aaic aaii aaoo abaa abab abac abai abb- abba abbb abbi abbo abca abcb abcc abci abia abib abic aboa abob aboo acaa acab acac acai acba acca accc acci acco aci- acia acic acoa aiai aiba aibo aica aicc aiia aiib aiic aioc aioi aoba aoca ba-i baaa baba babb babi babo bac- baca bacc baci baco baia baib baic baio bbbb bbci bcaa bcbc bcca bccc bcci bcia biao biba bibb bibi bibo bica bicc bici bico bio- bioc bioi boab boac boai boba bobb bobi bobo boca boco boi- boii boob booc c-bo caaa caab caac caba cabi cabo cac- caca cacc caci caco caia caib caic caio caoi cbac cbbc cbca cbcc cbia ccaa ccab ccac ccai ccba ccbc ccca cccb cccc ccci ccic ccii ccob ccoc ciaa ciao ciba cibc cibi cibo cica cicc cici cico ciia ciii ciob coai coba cobb cobi cobo coca coco coia coob iaaa iaac iaai iaba iaca iacc iaia ibac ibca ibia icaa icab icac icai icao icbc icca iccb iccc icci icco icoc iiac iica iiii iiio iioi iioo ioba iobi ioci ioii ioio iooi iooo oaic obai obba obbo obia oboi ocab ocac ocbc occa occc occi oiba oici oiii ooaa ooba oobi ooia oooo