bbbb bbdd bbdo bbrg bd-r bdog bobb bobo bobu bodb bodo bodu bogd bogg bogo boob bood boog boor bor- bord borg boro borr boru boud bour brdo brob brod brog broo bror brou brrr brud brug bubb bubo bubu budb budd budg budo budu bugg bugo bur- burb burd burg buro burr buru d-bo dddd ddub dobb dobu dod- dodd dodg dodo dog- dogg dogo dogu doob dood door dord doro dorr doru doub doud doug dour drob drod drog drou drub drug druu dub- dubb dubu dudd dudo dudu dugu duo- durg duro duru duur gbbo gddb gdor gggg gobo godo gogo good goog goor gorb gord gorg goro gorr gou- goud goug gour grbr grob 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 odbo oddd odoo odor odou odur ogb ogod ogog ogou ogro oooo oord orbb orbo orbu ordo ordu orgo oro- oror orro orub our- ouro ouu- rbbb rbbr rob- robb robo robu rodd rodo rogg rogo roob rood roog roor roro roru roub roud rrrr rubb rubu rudd rudo rugg rurd ruro ruru ruud ubbo ubod ubud udgb udoo uggo ugod ugro ugur uguu uor- urdu urgu uro- uroo urur uuuu