a-be a-ii aaaa aaab aaac aaae aaai aaba aabb aabc aabi aabt aaca aacb aacc aace aaci aact aaea aaec aaib aaic aaii aata aatc aatt abaa abab abac abae abai abat abb- abba abbb abbe abbi abbt abca abcb abcc abci abct abec abee abet abia abib abic abie abit abta ac-t acaa acab acac acae acai acat acba acca accc acce acci acct ace- acea acec acet aci- acia acic acie acta actc acte acti actt aeac aebi aecb aeci aect aeit aeta aetc aett aiai aiba aica aicc aice aiea aiee aiet aiia aiib aiic aita aite aiti aitt at-t ataa atab atac atae atai atat atca atcc atea atec atee atei atia atic atie atit atta atte atti ba-i baaa baat baba babb babe babi bac- baca bacc bace baci bact baia baib baic baie bait bata batc bate bati batt bbbb bbci bbeb bbet bcaa bcat bcbc bcca bccc bcci bcec bcet bcia bcie bcit bctc beat beba bebb bebe bebi beca beci beeb beet beia beic beit beta betc bete beti bett biat biba bibb bibe bibi bica bicc bice bici bieb biet bita bitc bite bitt btaa btcc btec btie bttb caaa caab caac caat caba cabe cabi cac- caca cacc cace caci caec caei caia caib caic cait cat- cata catb catc cate cati catt cbac cbat cbbc cbca cbcc cbce cbct cbea cbec cbee cbet cbia cbit cbta cbtc ccaa ccab ccac ccai ccat ccba ccbc ccca cccb cccc ccci ccee ccic ccii cctb cctc cctt ceac ceat ceba cec- ceca cece ceci cect ceeb ceec cet- ceta cete ceti ciaa ciat ciba cibc cibe cibi cica cicc cici cict ciee ciia ciii ciit cita citb cite citi citt ctab ctae ctba ctbi ctca ctec ctia ctic ctta eaba eaca eacc eaec eata eate eati ebac ebba ebbc ebcc ebic ebit ecaa ecac ecai ecat ecbc ecbe ecca eccb eccc ecce ecci ecct ecib ecit ect- ecta ectc eeca eeea eeee eeta eetc eete eica eiec eiei eita eitb eitc eiti etai etat etbc etcc etec etee etic etta ette etti i-be iaaa iaac iaai iaat iaba iaca iacc iact iaea iaec iaia iata iatc iate iati ibac ibat ibca ibea ibec ibet ibia ibie ibtb ibtc icaa icab icac icai icat icbc icca iccb iccc icci icct icea icec icee icet icta ieac ieat iecc ieet ieie ieta iett iiac iica iiie iiii iiit iita iitt itaa itac itai itat itbe itea itec itet itia itic itie itta taa- taat taba tabb tabc tabe tabi taca tacc tace taci tact taec taia tait tata tatb tate tati tatt tbca tbcb tbcc tbce tbit tbta tcca tccc tctc teac teat teba teca tect teec teet teia teic teie teta tete teti tett tiaa tiab tiba tibi tica ticc tice tie- tiea tiee tiei tiet tiit tita titc tite titi titt ttab ttbb tttt