bbbb bblb bbrc bcbc bccc bccl bcnu bcor bcru bcuc blcu blno blob bloc blon bloo blou blrc blub blur bnoc bnor bnrr bobb bobo bobu boco bocu boll boln bolo bolu bonc bonn bono bonu boob booc bool boon boor bor- born boro borr boru boul boun bour brcb brno brob broc brol bron broo bror brou brrr bruc brun bubb bubo bubu bucc buco bucu bulb bull bulu bunb bunn buno bunu buol buon bur- burb burl burn buro burr buru c-bo cbbc cbcc cbcl cbcn cbcr cbcu cblb cblc cbln cbol cbrl cbrn ccbc ccbn cccb cccc cccl cccu cclc ccnb ccnc ccnr ccnu ccob ccoc ccrc ccrl ccuc clob clon cloo clor clou clro club clun cnbc cnbl cnco cnrc cnrr cobb cobo cobu coco cocu col- colb coll coln colo colu con- conc conn cono coob cool coon cor- corb corc corl corn coro corr coub coul coun cour crbc crbu crcc crcr crob croc crol cron croo cror crub crun cub- cubb cucc cucn culb culc cull culo cuno cuon curb curl curn curo curr lbcc lblr lcbc lccc lcor lcrl llcc lllc llll lloc lloo lncr lob- lobb lobo locc locn loco locu loll lolo lono lonr loob looc lool loon loor lorn loro loul loun lour louu lroc lron lrrc lrrr lull lulu lunn luno nbbc nbbo nbcc nbco ncbc nccc nccn nccr nccu nclc ncln nclr ncnc ncoc ncor ncrc nlcc nlrb nnnn nobc nobo nobu nocl noco noll nolo non- nonn nono nonu noo- noob nool noon nooo noor nor- norb norc norn noro norr noul noun nour nrlb nroc nron nrrc nrrl nubc nubl nucu null nunc nunn nuno nuoc nuon nurc nurl nurn nurr nuru obbo oblu obol obon obor obro ocbc occc occn oclc ocon ocrl ocro ocrr ocul ocur olbo olcc ollo olon olor olur onc- onco onno onon onor onur oocr oolo oooo orbb orbo orbu orco orlo orlu ornc orno oro- oron oror orro orub oucc oulu oun- our- ourn ouro ouu- rbbb rbbr rbcl rcbc rcbo rccb rccc rcnl rcnr rcon rnbr rnco rob- robb robo robu rocc roco roll rolo ronc rono roob rool roon roor rorc roro roru roub roul roun rrrr rrun rubb rubu rull rulo runc runn runo rurc ruro ruru ruun ubbo ublo uboc ubon ucbc ucon ucrc ulbc ulcc ulco ullo ullr ulno ulo- uloc ulul uncc uncl unco unno unon unro uocc uolc uor- uro- urol uroo urun urur uulu uuno uuoc uuuu