a-ak a-ok aaaa aaab aaar aaba aabb aaka aaku aaoo aara aaro aaru abaa abab abak abar abau abb- abba abbb abbo abbr aboa abob abok aboo abor abou abra abro abua abuk akaa akao akar akka akko akku akok akr- akra akua aoba aora aorb arab arak arar arau arba arka arko aroa arob aroo aror arr- arra arrk arro arrr arru arua arub auaa aur- aura auro baaa baak baar baba babb babo babr babu bak- baka bako bakr baku bar- bara barb bark baro barr baru bau- bauk baur bbau bbbb boab boak boar boba bobb bobo bobu boka boko boku boob book boor bor- bora bork boro borr boru boua bouk bour brab brak brao brau brka brkb broa brob brok broo bror brou brrr buar buba bubb bubo bubu buka bukk buko buku bur- bura burb burk buro burr buru kaaa kaab kaak kaar kaba kabb kabo kabr kabu kaka kakk kako kaku kaoa kaok kaor kara karb kark karo karr karu kau- kaub kauk kauo kaur kbaa kbab kbak kbar kbba kbbb kbbk kbbo kbbr kbbu kbkb kbkk kbko kbkr kboa kbob kbok kboo kbra kbrb kbrk kbro kbru kbua kbub kbuk kbur kbuu kkaa kkar kkba kkbb kkbo kkbr kkkk kkoa kkob kkoo kkor kkrb kkrk kkro kkrr kkua kkuu koab koak koar koba kobb kobk kobo kobr kobu koka kokb kokk koko kokr koku koob kook kooo koor koou kora korb kork koro korr koru koua koub kour kouu krab krak krar krba krbb krbk krbr krka krkk krko krkr krku kroa krob krok kroo kror krrb krrk krro krrr krua kruk krur kuar kuau kuba kubb kubo kubr kubu 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 okak okka okko okok okor okra okro okur ooaa ooak ooba ooku oooo oora orab orak orao orar orba orbb orbo orbu orka orko oro- orok oror orra orro orub our- oura ouro ouu- raab raak raba rabb rabk rabo rabu raka rakk raku raob raok rara rarb rark raro raua raub rauk rbbb rbbr roab roak roar rob- roba robb robo robu roka rokk roko rokr roku roob rook roor rora rork roro roru roua roub rouk rrrr ruba rubb rubu ruka rukk ruku ruok rura ruro ruru uaru uaua ubar ubba ubbo ubra ukba ukko ukok ukra ukur uor- urao urau urba urka uro- uroa urok uroo urra uruk urur uuuu