a-ii aaaa aaab aaac aaai aaba aabb aabc aabi aabt aaca aacb aacc aaci aaco aact aaib aaic aaii aaoo aata aatc aatt abaa abab abac abai abat abb- abba abbb abbi abbo abbt abca abcb abcc abci abct abia abib abic abit aboa abob aboo abot abta ac-t acaa acab acac acai acat acba acca accc acci acco acct aci- acia acic acoa acot acta actc acti acto actt aiai aiba aibo aica aicc aiia aiib aiic aioc aioi aita aiti aitt aoba aoca aotc at-t ataa atab atac atai atat atca atcc atco atia atic atit atob atoc atoi atot atta atti atto ba-i baaa baat baba babb babi babo bac- baca bacc baci baco bact baia baib baic baio bait bata batc bati bato batt bbbb bbci bcaa bcat bcbc bcca bccc bcci bcia bcit bctc biao biat biba bibb bibi bibo bica bicc bici bico bio- bioc bioi biot bita bitc bito bitt boab boac boai boat boba bobb bobi bobo boca boco boi- boii boit boob booc boot bota botb boti boto bott btaa btcc btob bttb c-bo caaa caab caac caat caba cabi cabo cac- caca cacc caci caco caia caib caic caio cait caoi cat- cata catb catc cati cato catt cbac cbat cbbc cbca cbcc cbct cbia cbit cbot cbta cbtc ccaa ccab ccac ccai ccat ccba ccbc ccca cccb cccc ccci ccic ccii ccob ccoc cctb cctc cctt ciaa ciao ciat ciba cibc cibi cibo cica cicc cici cico cict ciia ciii ciit ciob cita citb citi cito citt coai coat coba cobb cobi cobo coca coco coct coia coit coob coot cota cotb cotc coti coto cott ctab ctba ctbi ctca ctia ctic ctot ctta iaaa iaac iaai iaat iaba iaca iacc iact iaia iata iatc iati ibac ibat ibca ibia ibot ibtb ibtc icaa icab icac icai icao icat icbc icca iccb iccc icci icco icct icoc icta iiac iica iiii iiio iiit iioi iioo iita iitt ioba iobi ioci ioii ioio ioit iooi iooo iota ioto itaa itac itai itat itia itic itoi itoo itta itto oaic obai obba obbo obia obit oboi obot ocab ocac ocat ocbc occa occc occi occt oct- octa octi octo oiba oici oiii oita oitc oiti ooaa ooba oobi ooia oooo ootb otac otic otit oto- otoo otta otti otto taa- taat taba tabb tabc tabi tabo taca tacc taci taco tact taia taio tait taoa tata tatb tati tato tatt tbca tbcb tbcc tbit tbta tcca tccc tctc tiaa tiab tiao tiba tibi tica ticc tico tiit tita titc titi tito titt toab toat toba tobi tobo tobt toca toci toco toit tooa toot tota totc toti toto tott ttab ttbb tttt