bbbb bbdd bbdo bbrc bcbc bccc bcnu bcor bcru bcuc bd-r bdbc bddc bnoc bnor bnrr bobb bobo bobu boco bocu bodb bodo bodu bonc bond bonn bono bonu boob booc bood boon boor bor- bord born boro borr boru boud boun bour brcb brdo brno brob broc brod bron broo bror brou brrr bruc brud brun bubb bubo bubu bucc buco bucu budb budd budo budu bunb bund bunn buno bunu buon bur- burb burd burn buro burr buru c-bo c-cd cbbc cbcc cbcn cbcr cbcu cbdb cbdc cbdn cbdo 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 cnbc cnco cndd cnrc cnrr cobb cobo cobu coco cocu codd con- conc cond conn cono coob cood coon cor- corb corc cord corn coro corr coub coud coun cour crbc crbu crcc crcr crdc crob croc crod cron croo cror crub crud crun cub- cubb cucc cucn cund cuno cuon curb curd curn curo curr d-bo dbcc dbrn dcbc dccb dccc dccu dcdb dcon dddd ddoc ddrc ddub dnoc dnrc dobb dobu doco docu dod- dodd dodo donc dond donn dono donr doob dood doon door dorc dord dorn doro dorr doru doub douc doud doun dour drbc drno drob drod dron drou drub druu dub- dubb dubc dubu duco dudd dudo dudu dunc dunn duno duo- duon durn duro duru duur nbbc nbbo nbcc nbco ncbc nccc nccn nccr nccu ncdc ncdn ncdr ncdu ncnc ncnd ncoc ncor ncrc ndcc nddb nddo ndoc ndor ndrc nndb nnnn nobc nobo nobu noco nodo nodu non- nonn nono nonu noo- noob noon nooo noor nor- norb norc nord norn noro norr noun nour nrdc nroc nron nrrc nrrd nubc nucu nudc nudd nudo nunc nunn nuno nuoc nuon nurc nurd nurn nurr nuru obbo obon obor obro ocbc occc occn ocon ocro ocrr ocur odbo oddd odnb odon odoo odor odou odur onc- oncd onco ondo onno onod onon onor onur oocr oooo oord orbb orbo orbu orco ordn ordo ordu ornc orno oro- 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 roco rodd rodo ronc rond rono roob rood roon roor rorc roro roru roub roud roun rrrr rrun rubb rubu rudd rudo runc rund runn runo rurc rurd ruro ruru ruud ruun ubbo uboc ubod ubon ubud ucbc ucdc ucdd ucon ucrc udbc udon udoo udun unbd uncc unco undo unno unon unro uocc uor- urdu uro- uroo urun urur uuno uuoc uuuu