a-be aaaa aaab aaac aaad aaae aaaf aaba aabb aabc aabd aabt aaca aacb aacc aacd aace aacf aact aada aadc aade aadt aaea aaec aafa aafb aafc aafd aaff aata aatc aatf aatt abaa abab abac abad abae abaf abat abb- abba abbb abbe abbt abca abcb abcc abcd abcf abct abda abec abed abee abet abff abta ac-t acaa acab acac acad acae acat acba acca accc accd acce accf acct acda acdb acdc acde acdf acdt ace- acea acec aced acet acfc acfd acfe acft acta actc acte actf actt adaa adab adac adad adae adat adba adbc adcc adda addc addd adde adea adeb adee adet adfa adfc adta aeac aeaf aecb aect aede aedt aeta aetc aetf aett afaa afad afat afca afcb afcc afdb afdc afee afet affa affc afft afta aftc afte at-t ataa atab atac atad atae atat atca atcc atcf atdt atea atec ated atee atef atfb atfc atfe atta atte baaa baad baaf baat baba babb babe bac- baca bacc bace bact bada badb badd bade baed bafc baff baft bata batc bate batf batt bbad bbbb bbdd bbeb bbet bbfc bcaa bcat bcbc bcca bccc bcda bcde bcec bcet bcfc bctc bdbc bddc bead beaf beat beba bebb bebe beca beda bede beeb beed beef beet befa befe beff beft beta betc bete bett bfca bfta bftt btaa btaf btcc btdt btec btfc bttb c-cd caaa caab caac caaf caat caba cabe cabf cac- caca cacc cace cada cadc cadd cade caec cafa cafb cafc cafe caff cat- cata catb catc catd cate catf catt cbac cbat cbbc cbca cbcc cbce cbct cbdb cbdc cbea cbec cbee cbef cbet cbfb cbfc cbta cbtc cbtf ccaa ccab ccac ccad ccaf ccat ccba ccbc ccca cccb cccc cccf ccdc ccdf cced ccee ccfa ccfc ccfd ccff cctb cctc cctt cd-e cdaa cdac cdad cdba cdbf cdda cddb cdec cdef cdfa cdfe ceac cead ceat ceba cec- ceca cece cect ceda cedd cede cedt ceeb ceec cef- cefa cefc cet- ceta cete cfaa cfab cfac cfae cfbc cfbt cfca cfcb cfcf cfda cffb cfta cftc cfte ctab ctae ctba ctca ctcf ctec ctfc ctta daab daad daae daba dabb dabt daca dace dact dada dade daeb dafa dafc dafe daff daft data date datt dbcc dbfc dbtt dcbc dcca dccb dccc dcct dcdb dcfc dctc dddd deac dead deae deaf deba debe debt dec- deca decc decd dece dect deda dedd dede deeb deed deef deet defe deff deft deta dete dfaf dfcc dfdt dffa dtaa dtac dtcc dted dtfc eaaf eaba eaca eacc eada eadb eadd eaec eafb eata eate ebac ebba ebbc ebcc ebed ebfc ecaa ecac ecad ecat ecbc ecbe ecca eccb eccc ecce ecct ecdc ecdf eced ecef ecfa ecfc ect- ecta ectc ectf edac edad edca edda eddc edde ede- edea edfa edta eeca eede eeea eeee eefa eefe eeta eetc eete efab efca efda efet effa eft- efta etat etbc etcc etec etee etfa etfb etfc etfe etta ette faaa faac faad faba fabd fabe faca facc face fact fada fadd fade faeb fafa fafc fafe faff fata fatc fate fatf fatt fcab fcat fcba fcca fccf fcda fdca fdtc fead feaf feat feba fece fect feda fede feeb feed feet fefc fefe feff feta fete fett ffcc ffee ffff fftf ft-c ftcd ftea ftfc taa- taaf taat taba tabb tabc tabe taca tacc tace tact tada tade taec tafa tafc tafe taff taft tata tatb tate tatt tbaf tbca tbcb tbcc tbcd tbce tbta tcad tcca tccc tcdd tcfc tctc tdac tddb tdff teac tead teat teba teca tect teda tedd tede teec teed teef teet tefc teff teft teta tete tett tfae tfca tfdc tfeb tfec tftc ttab ttbb ttfa ttfc ttff tttt