bbbb bbdd bbdo bbrc bcbc bccc bcnu bcor bcru bcuc bd-r bdbc bddc bnoc bnor bnrr bobb bobo bobu bock boco bocu bodb bodo bodu bokn boko boku bonc bond bonk bonn bono bonu boob booc bood book boon boor bor- bord bork born boro borr boru boud bouk boun bour brcb brdo brkb brno brob broc brod brok bron broo bror brou brrr bruc brud brun bubb bubo bubu bucc buck buco bucu budb budd budo budu bukk buko buku bunb bund bunk bunn buno bunu buon bur- burb burd burk burn buro burr buru c-bo c-cd cbbc cbcc cbcn cbcr cbcu cbdb cbdc cbdn cbdo cbkn cbko cbkr cbnd cbrd cbrn ccbc ccbn cccb cccc cccu ccdc ccdn ccdr ccnb ccnc ccnr ccnu ccob ccoc ccod ccrc ccuc cd-r cddb cddr cdnb cdnc cdon ckbc ckck ckco ckdo ckdu cknb cknc ckob ckoc ckoo ckor ckrc ckrd cnbc cnco cndd cnrc cnrr cobb cobo cobu cock coco cocu codd cok- coko con- conc cond conk conn cono coob cood cook coon cor- corb corc cord cork corn coro corr coub coud couk coun cour crbc crbu crcc crcr crdc crkc crob croc crod crok cron croo cror crub crud cruk crun cub- cubb cucc cuck cucn cuk- cund cuno cuon curb curd curn curo curr d-bo dbcc dbrn dcbc dccb dccc dccu dcdb dcon dcrk dddd ddoc ddrc ddub dkdc dnoc dnrc dnuk dobb dobu dock doco docu dod- dodd dodo doko donc dond donk donn dono donr doob dood dook doon door dorc dord dork dorn doro dorr doru doub douc doud douk doun dour drbc drno drob drod dron drou drub druk druu dub- dubb dubc dubu duck duco dudd dudo dudu duku dunc dunk dunn duno duo- duon durk durn duro duru duur kbbb kbbc kbbd kbbk kbbo kbbr kbbu kbcb kbck kbco kbcr kbcu kbdb kbdn kbdo kbdr kbkb kbkk kbko kbkr kbnd kbnn kbno kbnr kbnu kbob kboc kbod kbok kbon kboo kbrb kbrc kbrd kbrk kbrn kbro kbru kbub kbuc kbud kbuk kbun kbur kbuu kcbc kcbd kcbk kcbr kcbu kccb kccc kccd kcck kccr kccu kcdc kcdd kcdr kcdu kckc kckk kckn kcko kckr kcnb kcnd kcno kcnr kcob kcon kcor kcou kcrc kcrn kcro kcrr kcru kcub kcuk kdbb kdbn kdbr kdcc kdcd kdco kdcr kddb kddc kddd kddk kddr kdkb kdkd kdkk kdkn kdko kdkr kdnd kdnk kdnn kdno kdnr kdoc kdok kdrb kdro kdub kduc kdun kdur kkbb kkbd kkbn kkbo kkbr kkcb kkcd kkck kkcn kkco kkcr kkdc kkdd kkdo kkkk kknb kknd 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 kndb kndc kndd kndk kndn kndo kndr kndu knkk knnb knnd knnk knnr knob knoc knod knok knon knor knou knrb knrk knro knub knud knuk knur kobb kobc kobk kobn kobo kobr kobu kocb kocd kock kocn kodk kodo kodu kokb kokc kokk kokn koko kokr koku konc kond konk kono koob kooc kook koon kooo koor koou korb korc kord kork korn koro korr koru koub kour kouu krbb krbd krbk krbr krcb krcc krcd krcn krco krcu krdc krdd krdo krdr krdu krkc krkd krkk krkn krko krkr krku krnb krnd krnk krnn krno krnu krob kroc krod krok kroo kror krrb krrc krrk krrn krro krrr kruc kruk krun krur kubb kubc kubd kubo kubr kubu kucb kucc kucd kuco kucr kudd kudo kudu kukk kukn kuku kunc kund kunk kuno kunr kunu kuok kuon kuoo kurb kurd kurk kuro kurr kuru kuub kuuk kuur kuuu nbbc nbbo nbcc nbco ncbc nccc nccn nccr nccu ncdc ncdn ncdr ncdu ncnc ncnd ncoc ncor ncrc ncuk ndcc nddb nddo ndoc ndor ndrc nkok nkor nndb nnnn nobc nobo nobu nock noco nodo nodu noko non- nonn nono nonu noo- noob nook noon nooo noor nor- norb norc nord nork norn noro norr noun nour nrdc nroc nron nrrc nrrd nubc nubk nuck nucu nudc nudd nudo nuku nunc nunk nunn nuno nuoc nuon nurc nurd nurn nurr nuru nuuk obbo obkb obok obon obor obro ocbc occc occn ocon ocro ocrr ocur odbo oddd odnb odon odoo odor odou odur okcu okko okno okok okon okor okro okun okur onc- oncd onco ondo onno onod onon onor onur oocr ooku oooo oord orbb orbo orbu orco ordn ordo ordu orko ornc orno oro- orok oron oror orro orub oucc oudc oun- ound our- ourn ouro ouu- rbbb rbbr rcbc rcbo rccb rccc rcdc rcnr rcon rcrd rdoc rnbr rnco rndc rnod rob- robb robo robu rocc rock roco rodd rodo rokk roko rokr roku ronc rond ronk rono roob rood rook roon roor rorc rork roro roru roub roud rouk roun rrrr rrun rubb rubu ruck rudd rudo rukk rukn ruku runc rund runk runn runo ruok rurc rurd ruro ruru ruud ruun ubbo uboc ubod ubon ubud ucbc ucdc ucdd ucon ucrc udbc udon udoo uduk udun ukcc ukko uknc ukok ukon ukrc ukur unbd uncc unco undo unkn unko unno unon unro uocc uor- urdu uro- urok uroo uruk urun urur uuno uuoc uuuu