a-be a-fu aaaa aaab aaac aaae aaaf aaba aabb aabc aabt aaca aacb aacc aace aacf aact aacu aaea aaec aafa aafb aafc aaff aata aatc aatf aatt abaa abab abac abae abaf abat abau abb- abba abbb abbe abbt abca abcb abcc abcf abct abec abee abet abff abta abtu abua abue abuf abut ac-t acaa acab acac acae acat acba acca accc acce accf acct accu ace- acea acec acet acfc acfe acft acta actc acte actf actt actu acu- acue acuf acut aeac aeaf aecb aect aeta aetc aetf aett afaa afat afca afcb afcc afcu afee afet affa affc afft afta aftc afte afua afue at-t ataa atab atac atae atat atca atcc atcf atea atec atee atef atfb atfc atfe atta atte attu atua atub atuc auaa aube auca auce auct aufc aufe aut- aute baaa baaf baat baba babb babe babu bac- baca bacc bace bact bafc baff baft bata batc bate batf batt batu bau- bauf bbau bbbb bbeb bbet bbfc bcaa bcat bcbc bcca bccc bcec bcet bcfc bctc bcuc beaf beat beau beba bebb bebe beca becu beeb beef beet befa befe beff beft beta betc bete bett betu bfca bfta bftt btaa btaf btcc btec btfc bttb buat buba bubb bube bubu buca bucc buce bucu buea bueu bufc bufe buff but- buta bute butt caaa caab caac caaf caat caba cabe cabf cabu cac- caca cacc cace caec caeu cafa cafb cafc cafe caff cafu cat- cata catb catc cate catf catt catu cauc cauf caut cbac cbat cbbc cbca cbcc cbce cbct cbcu cbea cbec cbee cbef cbet cbfb cbfc cbta cbtc cbtf ccaa ccab ccac ccaf ccat ccba ccbc ccca cccb cccc cccf cccu ccee ccfa ccfc ccff cctb cctc cctt ccuc ccut ceac ceat ceba cebu cec- ceca cece cect ceeb ceec cef- cefa cefc cet- ceta cete cfaa cfab cfac cfae cfbc cfbt cfca cfcb cfcf cffb cfta cftc cfte ctab ctae ctba ctca ctcf ctec ctfc ctta cuau cub- cuba cubb cube cuca cucc cuce cufa cufc cuff cut- cuta cutc cute cutt eaaf eaba eaca eacc eaec eafb eata eate ebac ebba ebbc ebcc ebfc ecaa ecac ecat ecbc ecbe ecca eccb eccc ecce ecct ecef ecfa ecfc ect- ecta ectc ectf ecua eeca eeea eeee eefa eefe eeta eetc eete eetu efab efca efet effa eft- efta eftu efua etat etbc etcc etec etee etfa etfb etfc etfe etta ette ettu etua euba eubc eufc faaa faac faba fabe fabu faca facc face fact faeb fafa fafc fafe faff fata fatc fate fatf fatt faue faut fcab fcat fcba fcca fccf feaf feat feba fece fect feeb feet fefc fefe feff feta fete fett fetu ffcc ffee ffff fftf ft-c ftea ftfc ftub ftuc fuat fubb fubu fuc- fuca fuct fuet fufc fuff fufu futa fute futu taa- taaf taat taba tabb tabc tabe tabu taca tacc tace tact taec tafa tafc tafe taff taft tata tatb tate tatt tatu taua taub tauc taue taut tbaf tbca tbcb tbcc tbce tbta tcca tccc tccu tcfc tctc teac teat teba tebu teca tect teec teef teet tefc teff teft teta tete tett tetu teut tfae tfca tfcu tfeb tfec tftc ttab ttbb ttfa ttfc ttff tttt tuae tuat tuba tubb tube tubu tuca tucc tuet tufa tufc tufe tuff tuft tufu tuta tute tutt tutu uabc uaca uafa uata uatu uaua ubac ubba ubbe ubet ubtf ucat ucbc ucca ucea ucfa ucfb ucua ucut ueba uefa ufcu uffa uffe utac utau utec uttu uuta uutf uuuu