bbbb bbng bbrg bgon bgun bnor bnrr bobb bobo bobu bogg bogo bong bonn bono bonu boob boog boon boor bor- borg born boro borr boru boun bour brno brob brog bron broo bror brou brrr brug brun bubb bubo bubu bugg bugo bunb bung bunn buno bunu buon bur- burb burg burn buro burr buru gbbo gbon gggg ggrn gnoo gnrr gobo gogo gon- gong gonn gono gonu goog goon goor gorb gorg gorn goro gorr gou- goug goun gour grbr grob grog gron groo gror grou grrr grub grug grun grur gubb gubu gugb gugg gugu gung gunn gurb gurg gurn guro gurr guru nbbo ngon ngor ngou ngur nguu nngn nnnn nobo nobu nogg nogo non- nong nonn nono nonu noo- noob noon nooo noor nor- norb norg norn noro norr noun nour nron nung nunn nuno nuon nurn nurr nuru obbo obon obor obro ogb ogog ogon ogou ogro ogun ongo ongu onno onon onor onur oooo orbb orbo orbu orgn orgo orno oro- oron oror orro orub oun- oung our- ourn ouro ouu- rbbb rbbr rnbr rob- robb robo robu rogg rogo rong rono roob roog roon roor roro roru roub roun rrrr rrun rubb rubu rugg rung runn runo ruro ruru ruun ubbo ubon uggo ugro ugur uguu ungo ungu unno unon unro uor- urgu uro- uroo urun urur uuno uuuu