bbbb bbdd bbdo bbrc bbrg bcbc bcbg bccc bcor bcru bcuc bd-r bdbc bddc bdog bobb bobo bobu boco bocu bodb bodo bodu bogd bogg bogo boob booc bood boog boor bor- bord borg boro borr boru boud bour brcb brdo brob broc brod brog broo bror brou brrr bruc brud brug bubb bubo bubu bucc buco bucu budb budd budg budo budu bugg bugo bur- burb burd burg buro burr buru c-bo c-cd cbbc cbcc cbcr cbcu cbdb cbdc cbdo cbgb cbrd ccbc cccb cccc cccu ccdc ccdr ccgc ccob ccoc ccod ccrc ccrg ccuc cd-r cddb cddr cgcc cgcg cgro cobb cobo cobu coco cocu codd cogo coob cood cor- corb corc cord corg coro corr coub coud cour crbc crbu crcc crcr crdc crob croc crod croo cror crub crud crug cub- cubb cucc curb curd curo curr d-bo dbcc dcbc dccb dccc dccu dcdb dcgo dddd ddoc ddrc ddub dobb dobu doco docu dod- dodd dodg dodo dog- dogg dogo dogu doob dood door dorc dord doro dorr doru doub douc doud doug dour drbc drob drod drog drou drub drug druu dub- dubb dubc dubu duco dudd dudo dudu dugu duo- durg duro duru duur gbbo gc-c gcbc gccc gcrg gddb gdor gdrc gggg gobo gocr godo gogo good goog goor gorb gord gorg goro gorr gou- goud goug gour grbr grcc grdc grob groc grod grog groo gror grou grrr grub grug grur gubb gubu gudo gudu gugb gugg gugu gurb gurd gurg guro gurr guru obbo obor obro ocbc occc ocro ocrr ocur odbo oddd odoo odor odou odur ogb ogdc ogod ogog ogou ogro oocr oooo oord orbb orbo orbu orco ordo ordu orgo oro- oror orro orub oucc oudc our- ouro ouu- rbbb rbbr rcbc rcbo rccb rccc rcdc rcgc rcrd rcrg rdoc rob- robb robo robu rocc roco rodd rodo rogg rogo roob rood roog roor rorc roro roru roub roud rrrr rubb rubu rudd rudo rugg rurc rurd ruro ruru ruud ubbo uboc ubod ubud ucbc ucdc ucdd ucrc udbc udgb udoo ugcc ugcg uggo ugod ugro ugur uguu uocc uor- urdu urgu uro- uroo urur uuoc uuuu