a-ii aaaa aaab aaac aaai aaba aabb aabc aabi aabt aaca aacb aacc aaci aact aaib aaic aaii aata aatc aatt abaa abab abac abai abat abb- abba abbb abbi abbt abca abcb abcc abci abct abia abib abic abit abta ac-t acaa acab acac acai acat acba acca accc acci acct aci- acia acic acta actc acti actt aiai aiba aica aicc aiia aiib aiic aita aiti aitt at-t ataa atab atac atai atat atca atcc atia atic atit atta atti ba-i baaa baat baba babb babi bac- baca bacc baci bact baia baib baic bait bata batc bati batt bbbb bbci bcaa bcat bcbc bcca bccc bcci bcia bcit bctc biat biba bibb bibi bica bicc bici bita bitc bitt btaa btcc bttb caaa caab caac caat caba cabi cac- caca cacc caci caia caib caic cait cat- cata catb catc cati catt cbac cbat cbbc cbca cbcc cbct cbia cbit cbta cbtc ccaa ccab ccac ccai ccat ccba ccbc ccca cccb cccc ccci ccic ccii cctb cctc cctt ciaa ciat ciba cibc cibi cica cicc cici cict ciia ciii ciit cita citb citi citt ctab ctba ctbi ctca ctia ctic ctta iaaa iaac iaai iaat iaba iaca iacc iact iaia iata iatc iati ibac ibat ibca ibia ibtb ibtc icaa icab icac icai icat icbc icca iccb iccc icci icct icta iiac iica iiii iiit iita iitt itaa itac itai itat itia itic itta taa- taat taba tabb tabc tabi taca tacc taci tact taia tait tata tatb tati tatt tbca tbcb tbcc tbit tbta tcca tccc tctc tiaa tiab tiba tibi tica ticc tiit tita titc titi titt ttab ttbb tttt