a-be a-ii aaaa aaab aaac aaae aaai aaba aabb aabc aabi aaca aacb aacc aace aaci aaea aaec aaib aaic aaii abaa abab abac abae abai abb- abba abbb abbe abbi abca abcb abcc abci abec abee abia abib abic abie acaa acab acac acae acai acba acca accc acce acci ace- acea acec aci- acia acic acie aeac aebi aecb aeci aiai aiba aica aicc aice aiea aiee aiia aiib aiic ba-i baaa baba babb babe babi bac- baca bacc bace baci baia baib baic baie bbbb bbci bbeb bcaa bcbc bcca bccc bcci bcec bcia bcie beba bebb bebe bebi beca beci beeb beia beic biba bibb bibe bibi bica bicc bice bici bieb caaa caab caac caba cabe cabi cac- caca cacc cace caci caec caei caia caib caic cbac cbbc cbca cbcc cbce cbea cbec cbee cbia ccaa ccab ccac ccai ccba ccbc ccca cccb cccc ccci ccee ccic ccii ceac ceba cec- ceca cece ceci ceeb ceec ciaa ciba cibc cibe cibi cica cicc cici ciee ciia ciii eaba eaca eacc eaec ebac ebba ebbc ebcc ebic ecaa ecac ecai ecbc ecbe ecca eccb eccc ecce ecci ecib eeca eeea eeee eica eiec eiei i-be iaaa iaac iaai iaba iaca iacc iaea iaec iaia ibac ibca ibea ibec ibia ibie icaa icab icac icai icbc icca iccb iccc icci icea icec icee ieac iecc ieie iiac iica iiie iiii