a-be aaaa aaab aaac aaae aaar aaba aabb aabc aabt aaca aacb aacc aace aacr aact aacu aaea aaec aara aarc aare aart aaru aata aatc aatt abaa abab abac abae abar abat abau abb- abba abbb abbe abbr abbt abca abcb abcc abcr abct abec abee aber abet abra abrc abta abtu abua abue abut ac-t acaa acab acac acae acar acat acba acca accc acce acct accu ace- acea acec acer acet acr- acra acrc acre acrr acta actc acte actt actu acu- acue acur acut aeac aecb aect aeer aer- aera aerc aeta aetc aetr aett arab arac arae arar arat arau arba arbe arc- arca arce arct area arec aree aret areu arr- arra arrc arre arrr arrt arru arta artc arte artr arua arub arue arut at-t ataa atab atac atae atar atat atca atcc atcr atea atec atee ater atra atrc atre atru atta atte attr attu atua atub atuc atur auaa aube auca auce auct auer aur- aura aure aut- aute baaa baar baat baba babb babe babr babu bac- baca bacc bace bact baer bar- bara barb barc bare barr bart baru bata batc bate batt batu bau- baur bbau bbbb bbeb bbet bbrc bcaa bcar bcat bcbc bcca bccc bcec bcer bcet bcra bcru bctc bcuc bear beat beau beba bebb bebe beca becu beeb beer beet bera berc bere berr bert beru beta betc bete bett betu beur brab brac brae brat brau brca brcb brce brea breb brec bree brer bret brrr brtc bruc brue brut btaa btcc btec btrc btrt bttb buar buat buba bubb bube bubu buca bucc buce bucu buea buer bueu bur- bura burb bure burr burt buru but- buta bute butt caaa caab caac caat caba cabe cabu cac- caca cacc cace cacr caec caer caeu cara carb carc care carr cart cat- cata catb catc cate catt catu cauc caut cbac cbar cbat cbbc cbca cbcc cbce cbcr cbct cbcu cbea cbec cbee cber cbet cbre cbrt cbta cbtc ccaa ccab ccac ccar ccat ccba ccbc ccca cccb cccc cccu ccee ccra ccrc ccre ccrt cctb cctc cctt ccuc ccut ceac cear ceat ceba cebu cec- ceca cece cect ceeb ceec cer- cera cerc cere cert cet- ceta cete crab crac crar crat crau crbc crbu crca crcc crce crcr cre- crea creb crec cree cret creu crrt crtc crub crue crut ctab ctae ctba ctca ctec ctrc ctta cuau cub- cuba cubb cube cuca cucc cuce cuer cura curb cure curr curt cut- cuta cutc cute cutt eaba eaca eacc eaec eara earb eare eart eata eate ebac ebba ebbc ebbr ebcc eber ebru ebur ecaa ecac ecar ecat ecbc ecbe ecca eccb eccc ecce ecct ecra ecrc ecrr ecru ect- ecta ectc ecua eeca eeea eeee eera eerc eeta eetc eete eetu erat erau erba erbb erbe erca ercc erce ereb erec erer eret erra errc erre erta ertu erua erub eruc erur etat etbc etbr etcc etec etee eter etra etre etta ette ettu etua euba eubc euer eur- eura eurc eure eurt raab raat raba rabb rabe rabu rac- raca racc race ract racu raec raer rara rarb rare rata rate ratt ratu raua raub rauc raue raut rbbb rbbr rcac rcbc rccb rccc rcet rctc rea- reac reae rear reat reau reba rebb rebe rebu reca recc rece recr rect recu reeb reet rera rere rert reru reta rete retr rett reue reut reuu rrat rrrr rtca rtcc rtce rtee ruba rubb rube rubu ruca ruce ruct ruer ruet rura rurc rure ruru ruta rute rutt rutu taa- taar taat taba tabb tabc tabe tabu taca tacc tace tact taec taer tara tarb tarc tare tarr tart taru tata tatb tate tatr tatt tatu taua taub tauc taue taur taut tbar tbca tbcb tbcc tbce tbrb tbta tcca tccc tccu tctc teac tear teat teba tebu teca tecr tect teec teer teet ter- tera terc tere terr teru teta tete tetr tett tetu teut traa trab trac trae trat trau trca trcc tre- trea trec tree tret treu trra trtc trte trtr trub truc true trut truu ttab ttbb tter tttt tuae tuar tuat tuba tubb tube tubr tubu tuca tucc tuer tuet tura turb turc ture turr turt turu tuta tute tutt tutu uabc uaca uarc uart uaru uata uatu uaua ubac ubar ubba ubbe uber ubet ubra ucar ucat ucbc ucca ucea ucrc ucua ucut ueba urac urat urau urba urbe urca ure- urea uret urra urre urte urur urut utac utau utec uter uttu uuta uuuu