bbbb bbrc bcbc bccc bcnu bcor bcru bcuc bnoc bnor bnrr bobb bobo bobu boco bocu bonc bonn bono bonu boob booc boon boor bor- born boro borr boru boun bour brcb brno brob broc bron broo bror brou brrr bruc brun bubb bubo bubu bucc buco bucu bunb bunn buno bunu buon bur- burb burn buro burr buru c-bo cbbc cbcc cbcn cbcr cbcu cbrn ccbc ccbn cccb cccc cccu ccnb ccnc ccnr ccnu ccob ccoc ccrc ccuc cnbc cnco cnrc cnrr cobb cobo cobu coco cocu con- conc conn cono coob coon cor- corb corc corn coro corr coub coun cour crbc crbu crcc crcr crob croc cron croo cror crub crun cub- cubb cucc cucn cuno cuon curb curn curo curr nbbc nbbo nbcc nbco ncbc nccc nccn nccr nccu ncnc ncoc ncor ncrc nnnn nobc nobo nobu noco non- nonn nono nonu noo- noob noon nooo noor nor- norb norc norn noro norr noun nour nroc nron nrrc nubc nucu nunc nunn nuno nuoc nuon nurc nurn nurr nuru obbo obon obor obro ocbc occc occn ocon ocro ocrr ocur onc- onco onno onon onor onur oocr oooo orbb orbo orbu orco ornc orno oro- 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 roco ronc rono roob roon roor rorc roro roru roub roun rrrr rrun rubb rubu runc runn runo rurc ruro ruru ruun ubbo uboc ubon ucbc ucon ucrc uncc unco unno unon unro uocc uor- uro- uroo urun urur uuno uuoc uuuu