bbbb bbrc bcbc bccc bcnu bcor bcru bcuc bnoc bnor bnrr bobb bobo bobu bock boco bocu bokn boko boku bonc bonk bonn bono bonu boob booc book boon boor bor- bork born boro borr boru bouk boun bour brcb brkb brno brob broc brok bron broo bror brou brrr bruc brun bubb bubo bubu bucc buck buco bucu bukk buko buku bunb bunk bunn buno bunu buon bur- burb burk burn buro burr buru c-bo cbbc cbcc cbcn cbcr cbcu cbkn cbko cbkr cbrn ccbc ccbn cccb cccc cccu ccnb ccnc ccnr ccnu ccob ccoc ccrc ccuc ckbc ckck ckco cknb cknc ckob ckoc ckoo ckor ckrc cnbc cnco cnrc cnrr cobb cobo cobu cock coco cocu cok- coko con- conc conk conn cono coob cook coon cor- corb corc cork corn coro corr coub couk coun cour crbc crbu crcc crcr crkc crob croc crok cron croo cror crub cruk crun cub- cubb cucc cuck cucn cuk- cuno cuon curb curn curo curr kbbb kbbc kbbk kbbo kbbr kbbu kbcb kbck kbco kbcr kbcu kbkb kbkk kbko kbkr kbnn kbno kbnr kbnu kbob kboc kbok kbon kboo kbrb kbrc kbrk kbrn kbro kbru kbub kbuc kbuk kbun kbur kbuu kcbc kcbk kcbr kcbu kccb kccc kcck kccr kccu kckc kckk kckn kcko kckr kcnb kcno kcnr kcob kcon kcor kcou kcrc kcrn kcro kcrr kcru kcub kcuk kkbb kkbn kkbo kkbr kkcb kkck kkcn kkco kkcr kkkk kknb kknn kkno kknu kkob kkon kkoo kkor kkrb kkrc kkrk kkrn kkro kkrr kkuu knbb knbc knbn knbr knbu kncb knck kncn knco kncr kncu knkk knnb knnk knnr knob knoc knok knon knor knou knrb knrk knro knub knuk knur kobb kobc kobk kobn kobo kobr kobu kocb kock kocn kokb kokc kokk kokn koko kokr koku konc konk kono koob kooc kook koon kooo koor koou korb korc kork korn koro korr koru koub kour kouu krbb krbk krbr krcb krcc krcn krco krcu krkc krkk krkn krko krkr krku krnb krnk krnn krno krnu krob kroc krok kroo kror krrb krrc krrk krrn krro krrr kruc kruk krun krur kubb kubc kubo kubr kubu kucb kucc kuco kucr kukk kukn kuku kunc kunk kuno kunr kunu kuok kuon kuoo kurb kurk kuro kurr kuru kuub kuuk kuur kuuu nbbc nbbo nbcc nbco ncbc nccc nccn nccr nccu ncnc ncoc ncor ncrc ncuk nkok nkor nnnn nobc nobo nobu nock noco noko non- nonn nono nonu noo- noob nook noon nooo noor nor- norb norc nork norn noro norr noun nour nroc nron nrrc nubc nubk nuck nucu nuku nunc nunk nunn nuno nuoc nuon nurc nurn nurr nuru nuuk obbo obkb obok obon obor obro ocbc occc occn ocon ocro ocrr ocur okcu okko okno okok okon okor okro okun okur onc- onco onno onon onor onur oocr ooku oooo orbb orbo orbu orco orko ornc orno oro- orok oron oror orro orub oucc oun- our- ourn ouro ouu- rbbb rbbr rcbc rcbo rccb rccc rcnr rcon rnbr rnco rob- robb robo robu rocc rock roco rokk roko rokr roku ronc ronk rono roob rook roon roor rorc rork roro roru roub rouk roun rrrr rrun rubb rubu ruck rukk rukn ruku runc runk runn runo ruok rurc ruro ruru ruun ubbo uboc ubon ucbc ucon ucrc ukcc ukko uknc ukok ukon ukrc ukur uncc unco unkn unko unno unon unro uocc uor- uro- urok uroo uruk urun urur uuno uuoc uuuu