bbbb bbdd bbdo bd-r bnor bnrr bobb bobo bobu bodb bodo bodu bond bonn bono bont bonu boob bood boon boor boot bor- bord born boro borr bort boru botb botd botn boto bott boud boun bour bout brdo brdt brno brob brod bron broo bror brot brou brrr brud brun brut btdt btob btor btrt bttb bubb bubo bubu budb budd budo budu bunb bund bunn buno bunt bunu buon bur- burb burd burn buro burr burt buru but- buto butt d-bo dbrn dbtt dddd ddot ddub dntt dnut dobb dobu dod- dodd dodo dond donn dono donr dont doob dood doon door doot dord dorn doro dorr dort doru dotd doto dott doub doud doun dour dout drno drob drod dron drot drou drub drut druu dtnb dtor dtot dub- dubb dubu dudd dudo dudu dunn duno dunt duo- duon durn duro durt duru duur duut nbbo nddb nddo ndnt ndor ndut nndb nnnn nnot nntn nobo nobu nodo nodu non- nonn nono nont nonu noo- noob noon nooo noor noot nor- norb nord norn noro norr nort not- noto nott noun nour nout nron nrrd ntnd ntnu ntru ntto nttr nudd nudo nunn nuno nunt nuon nurd nurn nurr nurt nuru nutt nutu obbo obdt obon obor obot obro obtd odbo oddd odnb odon odoo odor odot odou odtu odur ondo onno onod onon onor ont- onto onur onut oont oooo oord oort ootb orbb orbo orbu ordn ordo ordu orno oro- oron oror orot orro orto orub otbd oto- oton otoo otor otro otto ottu otur oun- ound our- ourn ouro ourt out- outb outo ouu- rbbb rbbr rnbr rnnt rnod rnot rntd rnut rob- robb robo robt robu rodd rodo rond rono ront roob rood roon roor root roro rort roru rotn roto rotr rott roub roud roun rout rrrr rrun rtdt rtnd rubb rubu rudd rudo rund runn runo runt rurd ruro ruru ruto rutt rutu ruud ruun tbrb tddb tdor tndd tnut tobo tobt tobu todd todo todt todu tonb tonn tono tonu tood toon toor toot tord torn toro torr tort toru totd toto totr tott toun tour tout trno trod tron troo trot trou trtr trub trud trun trut truu ttbb tton tttt tubb tubo tubr tubu tudu tunb tund tunn tuno tunu tuor turb turd turn turo turr turt turu tuto tutt tutu tuuo ubbo ubod ubon ubud udon udoo udot udun unbd undo unno unon unro untb unto unut uor- urdu uro- uroo urun urur urut utor utto uttu uuno uuuu