bbbb bcbc bccc bcnu bcuc bnoc bobb bobo bobu bock boco bocu bokn boko boku bonc bonk bonn bono bonu boob booc book boon bouk boun bubb bubo bubu bucc buck buco bucu bukk buko buku bunb bunk bunn buno bunu buon c-bo cbbc cbcc cbcn cbcu cbkn cbko ccbc ccbn cccb cccc cccu ccnb ccnc ccnu ccob ccoc ccuc ckbc ckck ckco cknb cknc ckob ckoc ckoo cnbc cnco cobb cobo cobu cock coco cocu cok- coko con- conc conk conn cono coob cook coon coub couk coun cub- cubb cucc cuck cucn cuk- cuno cuon kbbb kbbc kbbk kbbo kbbu kbcb kbck kbco kbcu kbkb kbkk kbko kbnn kbno kbnu kbob kboc kbok kbon kboo kbub kbuc kbuk kbun kbuu kcbc kcbk kcbu kccb kccc kcck kccu kckc kckk kckn kcko kcnb kcno kcob kcon kcou kcub kcuk kkbb kkbn kkbo kkcb kkck kkcn kkco kkkk kknb kknn kkno kknu kkob kkon kkoo kkuu knbb knbc knbn knbu kncb knck kncn knco kncu knkk knnb knnk knob knoc knok knon knou knub knuk kobb kobc kobk kobn kobo kobu kocb kock kocn kokb kokc kokk kokn koko koku konc konk kono koob kooc kook koon kooo koou koub kouu kubb kubc kubo kubu kucb kucc kuco kukk kukn kuku kunc kunk kuno kunu kuok kuon kuoo kuub kuuk kuuu nbbc nbbo nbcc nbco ncbc nccc nccn nccu ncnc ncoc ncuk nkok nnnn nobc nobo nobu nock noco noko non- nonn nono nonu noo- noob nook noon nooo noun nubc nubk nuck nucu nuku nunc nunk nunn nuno nuoc nuon nuuk obbo obkb obok obon ocbc occc occn ocon okcu okko okno okok okon okun onc- onco onno onon ooku oooo oucc oun- ouu- ubbo uboc ubon ucbc ucon ukcc ukko uknc ukok ukon uncc unco unkn unko unno unon uocc uuno uuoc uuuu