a-ak a-ok aaaa aaab aaac aaar aaba aabb aabc aaca aacb aacc aack aaco aacr aacu aaka aaku aaoo aara aarc aaro aaru abaa abab abac abak abar abau abb- abba abbb abbo abbr abca abcb abcc abcr aboa abob abok aboo abor abou abra abrc abro abua abuk acaa acab acac acar acba acca accc acco accu acoa acor acou acr- acra acrc acro acrr acu- acuo acur akaa akao akar akca akka akko akku akok akr- akra akua aoba aoca aora aorb arab arac arak arar arau arba arc- arca arco arka arko aroa arob aroo aror arr- arra arrc arrk arro arrr arru arua arub auaa auca aur- aura auro baaa baak baar baba babb babo babr babu bac- baca bacc back baco bak- baka bako bakr baku bar- bara barb barc bark baro barr baru bau- bauk baur bbau bbbb bbrc bcaa bcar bcbc bcca bccc bcor bcra bcru bcuc boab boac boak boar boba bobb bobo bobu boca bock boco bocu boka boko boku boob booc book boor bor- bora bork boro borr boru boua bouk bour brab brac brak brao brau brca brcb brka brkb broa brob broc brok broo bror brou brrr bruc buar buba bubb bubo bubu buca bucc buck buco bucu buka bukk buko buku bur- bura burb burk buro burr buru c-bo caaa caab caac caba cabo cabu cac- caca cacc cack caco cacr caka caor cara carb carc cark caro carr cauc cauk cauo cbac cbar cbbc cbca cbcc cbcr cbcu cbka cbko cbkr ccaa ccab ccac ccar ccba ccbc ccca cccb cccc cccu ccob ccoc ccra ccrc ccuc ckac ckbc ckck ckco ckoa ckob ckoc ckoo ckor ckrc coak coba cobb cobo cobu coca cock coco cocu cok- coka coko coob cook cor- cora corb corc cork coro corr coua coub couk cour crab crac crar crau crbc crbu crca crcc crcr crkc crob croc crok croo cror crub cruk cuau cub- cuba cubb cuca cucc cuck cuk- cuka cura curb curo curr kaaa kaab kaak kaar kaba kabb kabc kabo kabr kabu kacb kacc kaco kacu kaka kakc kakk kako kaku kaoa kaoc kaok kaor kara karb kark karo karr karu kau- kaub kauc kauk kauo kaur kbaa kbab kbac kbak kbar kbba kbbb kbbc kbbk kbbo kbbr kbbu kbca kbcb kbck kbco kbcr kbcu kbkb kbkk kbko kbkr kboa kbob kboc kbok kboo kbra kbrb kbrc kbrk kbro 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 kcko kckr kcob kcor kcou kcrc kcro kcrr kcru kcua kcub kcuk kkaa kkac kkar kkba kkbb kkbo kkbr kkcb kkck kkco kkcr kkkk kkoa kkob kkoo kkor kkrb kkrc kkrk kkro kkrr kkua kkuu koab koac koak koar koba kobb kobc kobk kobo kobr kobu koca kocb kock koka kokb kokc kokk koko kokr koku koob kooc kook kooo koor koou kora korb korc kork koro korr koru koua koub kour kouu krab krac krak krar krba krbb krbk krbr krca krcb krcc krco krcu krka krkc krkk krko krkr krku kroa krob kroc krok kroo kror krrb krrc krrk krro krrr krua kruc kruk krur kuac kuar kuau kuba kubb kubc kubo kubr kubu kuca kucb kucc kuco kucr kuka kukk kuku kuoa kuok kuoo kura kurb kurk kuro kurr kuru kuub kuuk kuur kuuu oaau oara obak obba obbo obkb obok obor obra obro ocab ocac ocak ocbc occa occc ocra ocro ocrr ocur okak okcu okka okko okok okor okra okro okur ooaa ooak ooba oocr ooku oooo oora orab orac orak orao orar orba orbb orbo orbu orca orco orka orko oro- orok oror orra orro orub ouac oucc our- oura ouro ouu- raab raak raba rabb rabk rabo rabu rac- raca racc rack raco racu raka rakk raku raob raoc raok rara rarb rark raro raua raub rauc rauk rbbb rbbr rcac rcbc rcbo rccb rccc roab roak roar rob- roba robb robo robu roca rocc rock roco roka rokk roko rokr roku roob rook roor rora rorc rork roro roru roua roub rouk rrrr ruba rubb rubu ruca ruck ruka rukk ruku ruok rura rurc ruro ruru uabc uaca uaoc uarc uaru uaua ubac ubar ubba ubbo uboc ubra ucak ucar ucbc ucca ucka ucrc ucua ukba ukcc ukko ukok ukra ukrc ukur uocc uor- urac urao urau urba urca urka uro- uroa urok uroo urra uruk urur uuoc uuuu