a-ak aaaa aaab aaac aaar aaba aabb aabc aaca aacb aacc aack aacr aacu aaka aaku aara aarc aaru abaa abab abac abak abar abau abb- abba abbb abbr abca abcb abcc abcr abra abrc abua abuk acaa acab acac acar acba acca accc accu acr- acra acrc acrr acu- acur akaa akar akca akka akku akr- akra akua arab arac arak arar arau arba arc- arca arka arr- arra arrc arrk arrr arru arua arub auaa auca aur- aura baaa baak baar baba babb babr babu bac- baca bacc back bak- baka bakr baku bar- bara barb barc bark barr baru bau- bauk baur bbau bbbb bbrc bcaa bcar bcbc bcca bccc bcra bcru bcuc brab brac brak brau brca brcb brka brkb brrr bruc buar buba bubb bubu buca bucc buck bucu buka bukk buku bur- bura burb burk burr buru caaa caab caac caba cabu cac- caca cacc cack cacr caka cara carb carc cark carr cauc cauk cbac cbar cbbc cbca cbcc cbcr cbcu cbka cbkr ccaa ccab ccac ccar ccba ccbc ccca cccb cccc cccu ccra ccrc ccuc ckac ckbc ckck ckrc crab crac crar crau crbc crbu crca crcc crcr crkc crub cruk cuau cub- cuba cubb cuca cucc cuck cuk- cuka cura curb curr kaaa kaab kaak kaar kaba kabb kabc kabr kabu kacb kacc kacu kaka kakc kakk kaku kara karb kark karr karu kau- kaub kauc kauk kaur kbaa kbab kbac kbak kbar kbba kbbb kbbc kbbk kbbr kbbu kbca kbcb kbck kbcr kbcu kbkb kbkk kbkr kbra kbrb kbrc kbrk kbru kbua kbub kbuc kbuk kbur kbuu kcaa kcab kcac kcar kcau kcba kcbc kcbk kcbr kcbu kcca kccb kccc kcck kccr kccu kckc kckk kckr kcrc kcrr kcru kcua kcub kcuk kkaa kkac kkar kkba kkbb kkbr kkcb kkck kkcr kkkk kkrb kkrc kkrk kkrr kkua kkuu krab krac krak krar krba krbb krbk krbr krca krcb krcc krcu krka krkc krkk krkr krku krrb krrc krrk krrr krua kruc kruk krur kuac kuar kuau kuba kubb kubc kubr kubu kuca kucb kucc kucr kuka kukk kuku kura kurb kurk kurr kuru kuub kuuk kuur kuuu raab raak raba rabb rabk rabu rac- raca racc rack racu raka rakk raku rara rarb rark raua raub rauc rauk rbbb rbbr rcac rcbc rccb rccc rrrr ruba rubb rubu ruca ruck ruka rukk ruku rura rurc ruru uabc uaca uarc uaru uaua ubac ubar ubba ubra ucak ucar ucbc ucca ucka ucrc ucua ukba ukcc ukra ukrc ukur urac urau urba urca urka urra uruk urur uuuu