a-ak a-be aaaa aaab aaac aaae aaar aaba aabb aabc aaca aacb aacc aace aack aacr aacu aaea aaec aaka aake aaku aara aarc aare aaru abaa abab abac abae abak abar abau abb- abba abbb abbe abbr abca abcb abcc abcr abec abee aber abra abrc abua abue abuk acaa acab acac acae acar acba acca accc acce accu ace- acea acec acek acer acke acr- acra acrc acre acrr acu- acue acur aeac aecb aeer aeka aer- aera aerc akaa akae akar akca akee aker akeu akka akku akr- akra akre akua arab arac arae arak arar arau arba arbe arc- arca arce area arec aree arek areu arka arke arr- arra arrc arre arrk arrr arru arua arub arue auaa aube auca auce auer auke aur- aura aure baaa baak baar baba babb babe babr babu bac- baca bacc bace back baek baer bak- baka bake bakr baku bar- bara barb barc bare bark barr baru bau- bauk baur bbau bbbb bbeb bbrc bcaa bcar bcbc bcca bccc bcec bcer bcra bcru bcuc beak bear beau beba bebb bebe beca beck becu beeb beek beer beka beke bera berc bere berk berr beru beuk beur brab brac brae brak brau brca brcb brce brea breb brec bree brek brer brka brkb brrr bruc brue buar buba bubb bube bubu buca bucc buce buck bucu buea buer bueu buka buke bukk buku bur- bura burb bure burk burr buru caaa caab caac caba cabe cabu cac- caca cacc cace cack cacr caec caer caeu caka cake cara carb carc care cark carr cauc cauk cbac cbar cbbc cbca cbcc cbce cbcr cbcu cbea cbec cbee cber cbka cbkr cbre ccaa ccab ccac ccar ccba ccbc ccca cccb cccc cccu ccee ccra ccrc ccre ccuc ceac cear ceba cebu cec- ceca cece ceeb ceec ceke cer- cera cerc cere ckac ckbc ckbe ckck cker ckrc crab crac crar crau crbc crbu crca crcc crce crcr cre- crea creb crec cree creu crkc crub crue cruk cuau cub- cuba cubb cube cuca cucc cuce cuck cuek cuer cuk- cuka cuke cura curb cure curr eaba eaca eacc eaec eara earb eare ebac ebba ebbc ebbr ebcc eber ebru ebur ecaa ecac ecar ecbc ecbe ecca eccb eccc ecce ecka ecra ecrc ecrr ecru ecua eeca eeea eeee eeka eeke eera eerc eka- ekab ekeb ekek eker ekka ekur erau erba erbb erbe erca ercc erce ereb erec erer erke erra errc erre erua erub eruc erur euba eubc euer eur- eura eurc eure kaaa kaab kaak kaar kaba kabb kabc kabe kabr kabu kacb kacc kace kacu kaer kaka kakc kake kakk kaku kara karb kare kark karr karu kau- kaub kauc kaue kauk kaur kbaa kbab kbac kbae kbak kbar kbba kbbb kbbc kbbe kbbk kbbr kbbu kbca kbcb kbce kbck kbcr kbcu kbeb kbec kbee kbek kber kbkb kbkk kbkr kbra kbrb kbrc kbre kbrk kbru kbua kbub kbuc kbue kbuk kbur kbuu kcaa kcab kcac kcar kcau kcba kcbc kcbk kcbr kcbu kcca kccb kccc kcck kccr kccu kcea kceb kcec kcee kceu kckc kckk kckr kcrc kcrr kcru kcua kcub kcue kcuk kea- keak kear keau keba kebb kebc kebe kebr kebu keca keck kecr keek keer keka kekb kekc keke keku ker- kera kerb kerc kere kerk kerr keru keur kkaa kkac kkar kkba kkbb kkbe kkbr kkcb kkck kkcr kkea kkkk kkrb kkrc kkre kkrk kkrr kkua kkuu krab krac krae krak krar krba krbb krbe krbk krbr krca krcb krcc krce krcu krea kreb krec kree krek kreu krka krkc krke krkk krkr krku krrb krrc krre krrk krrr krua kruc krue kruk krur kuac kuar kuau kuba kubb kubc kube kubr kubu kuca kucb kucc kuce kucr kuek kueu kuka kuke kukk kuku kura kurb kure kurk kurr kuru kuub kuuk kuur kuuu raab raak raba rabb rabe rabk rabu rac- raca racc race rack racu raec raer raka rake rakk raku rara rarb rare rark raua raub rauc raue rauk rbbb rbbr rcac rcbc rccb rccc rea- reac reae reak rear reau reba rebb rebe rebk rebu reca recc rece reck recr recu reeb reek reka reke rera rere reru reue reuk reuu rrrr ruba rubb rube rubu ruca ruce ruck ruer ruka ruke rukk ruku rura rurc rure ruru uabc uaca uarc uaru uaua ubac ubar ubba ubbe ubek uber ubra ucak ucar ucbc ucca ucea ucka ucrc ucua ueba ukba ukcc ukek ukeu ukra ukrc ukur urac urau urba urbe urca ure- urea urka urke urra urre uruk urur uuuu