a-be a-do a-fu aaaa aaab aaac aaad aaae aaaf aaba aabb aabc aabd aabt aaca aacb aacc aacd aace aacf aaco aact aacu aada aadc aade aadt aadu aaea aaec aafa aafb aafc aafd aaff aaoe aaoo aata aatc aatf aatt abaa abab abac abad abae abaf abat abau abb- abba abbb abbe abbo abbt abca abcb abcc abcd abcf abct abda abdo abdu abec abed abee abet abff aboa abob abod abof aboo abot abou abta abtu abua abud abue abuf abut ac-t acaa acab acac acad acae acat acba acca accc accd acce accf acco acct accu acda acdb acdc acde acdf acdt ace- acea acec aced acet acfc acfd acfe acft acoa acod acoe acot acou acta actc acte actf acto actt actu acu- acue acuf acuo acut adaa adab adac adad adae adao adat adba adbc adcc adda addc addd adde addo addu adea adeb adee adeo adet adfa adfc adob adoc adod adoe adoo adot adta adua adub adue aeac aeaf aecb aect aede aedt aeta aetc aetf aeto aett afaa afad afao afat afca afcb afcc afcu afdb afdc afee afet affa affc affo afft afoa afoe afoo afta aftc afte afua afud afue aoba aoca aoce aoeu aotc aotd aotf aouf aout at-t ataa atab atac atad atae atat atca atcc atcf atco atdt atea atec ated atee atef ateo atfb atfc atfe atob atoc atod atoe atof atot atta atte atto attu atua atub atuc auaa aube auca auce auct audc aude audo aufc aufe aut- aute auto baaa baad baaf baat baba babb babe babo babu bac- baca bacc bace baco bact bada badb badd bade bado badu baed bafc baff bafo baft bata batc bate batf bato batt batu bau- baud bauf bbad bbau bbbb bbdd bbdo bbeb bbet bbfc bcaa bcat bcbc bcca bccc bcda bcde bcec bcet bcfc bcof bctc bcuc bdbc bddc bduf bead beaf beat beau beba bebb bebe bebo beca becu beda bede bedo bedu beeb beed beef beet befa befe beff befo beft beo- beod beof beot beta betc bete beto bett betu bfca bfta bftt boab boac boad boat boba bobb bobe bobo bobu boca boce boco bocu boda bodb bode bodo bodu boea boec boee boef boeo boet bofa bofd bofe boff bofu boob booc bood booe boof boot bota botb botd bote boto bott boua boud boue bouf bout btaa btaf btcc btdt btec btfc btob bttb buad buat buba bubb bube bubo bubu buca bucc buce buco bucu buda budb budd bude budo budu buea bueu bufc bufe buff bufo but- buta bute buto butt c-bo c-cd caaa caab caac caaf caat caba cabe cabf cabo cabu cac- caca cacc cace caco cada cadc cadd cade cado cadu caec caeu cafa cafb cafc cafe caff cafu caod cat- cata catb catc catd cate catf cato catt catu cauc cauf cauo caut cbac cbat cbbc cbca cbcc cbce cbct cbcu cbdb cbdc cbdo cbea cbec cbee cbef cbet cbfb cbfc cbot cbta cbtc cbtf ccaa ccab ccac ccad ccaf ccat ccba ccbc ccca cccb cccc cccf cccu ccdc ccdf cced ccee ccfa ccfc ccfd ccff ccob ccoc ccod cctb cctc cctt ccuc ccut cd-e cdaa cdac cdad cdba cdbf cdda cddb cdec cdef cdfa cdfe cdot ceac cead ceat ceba cebu cec- ceca cece ceco cect ceda cedd cede cedo cedt cedu ceeb ceec cef- cefa cefc ceou cet- ceta cete ceto cfaa cfab cfac cfae cfao cfbc cfbt cfca cfcb cfcf cfco cfda cffb cfoa cfta cftc cfte coad coat coba cobb cobe cobo cobu coca coce coco coct cocu coda codd code coed cofc cofe coff coft coob cood coof coot cota cotb cotc cote coto cott cotu coua coub coud coue cout ctab ctae ctba ctca ctcf ctec ctfc ctfo ctot ctta cuau cub- cuba cubb cube cuca cucc cuce cuda cude cued cufa cufc cuff cufo cut- cuta cutc cute cuto cutt d-bo daab daad daae daau daba dabb dabo dabt dabu daca dace dact dada dade dado dadu daeb daeu dafa dafc dafe daff dafo daft daou data date dato datt datu daub daud daue daut dbcc dbfc dbfo dbtt dcbc dcca dccb dccc dcct dccu dcdb dcfc dctc dddd ddoc ddot ddub deac dead deae deaf deau deba debe debt debu dec- deca decc decd dece deco dect deda dedd dede dedo dedu deeb deed deef deet defe deff defo deft deta dete deto deua deue deut dfaf dfcc dfco dfcu dfdt dffa dfoe doab doae doat doba dobb dobe dobu doca doce doco doct docu dod- doda dodd dode dodo doea doff doob dood doof doot dota dotd dote doto dott doub douc doud doue douf dout dtaa dtac dtcc dted dtfc dtot duaa duab duad duat dub- duba dubb dubc dube dubu duca duce duco duct duda dudd dude dudo dudu duet dufc duff dufu duo- duta dute duut eaaf eaba eaca eacc eada eadb eadd eaec eafb eata eate ebac ebba ebbc ebbo ebcc ebed ebfc eboe eboo ecaa ecac ecad ecao ecat ecbc ecbe ecca eccb eccc ecce ecco ecct ecdc ecdf eced ecef ecfa ecfc eco- ecod ecot ecou ect- ecta ectc ectf ecto ecua edac edad edca edda eddc edde eddo ede- edea edfa edfu edoc edod edou edta educ eeca eede eedu eeea eeee eefa eefe eeoc eeta eetc eete eetu efab efca efco efda efeo efet effa eft- efta eftu efua eocd eode eota eotc eotd eoto etat etbc etcc etco etec etee etfa etfb etfc etfe etoe etta ette etto ettu etua euba eubc eucd eude eufc faaa faac faad faba fabd fabe fabo fabu faca facc face fact fada fadd fade fado faeb fafa fafc fafe faff fafo fata fatc fate fatf fato fatt faud faue faut fcab fcat fcba fcca fccf fcda fcot fcto fdca fdoa fdoc fdot fdtc fead feaf feat feba febo fece fect feda fede feeb feed feet fefc fefe feff fefo feod feof feta fete fett fetu feud ffcc ffee