a-ii aaaa aaab aaac aaai aaba aabb aabc aabi aaca aacb aacc aaci aaib aaic aaii abaa abab abac abag abai abb- abba abbb abbi abca abcb abcc abci abia abib abic abig acaa acab acac acag acai acba acca accc acci acga acgi aci- acia acic agac agag agai agba agca agcc agga aggi agia agib agic agig agii aiai aiba aica aicc aiga aiia aiib aiic ba-i baaa baba babb babi bac- baca bacc baci baga bagg bagi baia baib baic baig bbbb bbci bbga bcaa bcbc bcbg bcca bccc bcci bcia bgca bgia biba bibb bibi bica bicc bicg bici biga bigb bigc bigg caaa caab caac caba cabg cabi cac- caca cacc caci caga cagg cagi caia caib caic cbac cbbc cbca cbcc cbga cbgb cbia ccaa ccab ccac ccag ccai ccba ccbc ccca cccb cccc ccci ccga ccgc ccic ccii cgac cgcc cgcg ciaa ciba cibc cibi cica cicc cici ciga cigi ciia ciii gaba gabb gabi gaga gagg gagi gaia gaig gbag gc-c gcaa gcbc gccc gcic gcii gggg giaa giac giai giba gibb gica giga gigg gigi iaaa iaac iaai iaba iaca iacc iaia ibac ibca ibga ibia icaa icab icac icag icai icbc icca iccb iccc icci icga icgc igac igba igbc igcc igga igia iiac iica iiii