bbbb bbdd bbdo bblb bd-r bdii bibb bibi bibl bibo bidi bido bidr bidu bild bili bill bilo bilu bio- bioi biol biou birb bird biri birl biro birr biru bldr blio blir blob blod bloo blou blub blud blur bobb bobi bobo bobu bodb bodi bodo bodu boi- boid boii boil boiu bold boli boll bolo bolu boob bood bool boor bor- bord bori boro borr boru boud boul bour brdo brid bril brio brob brod brol broo bror brou brrr brud bubb bubi bubo bubu budb budd budi budl budo budu buid buir buiu bulb buld buli bull bulu buol bur- burb burd buri burl buro burr buru d-bo dddd ddub dibb dibo didi dido didu diii dili dill dilo diol dior diou dird dirl dirr dlbd dlib dlii dlil dobb dobi dobl dobu dod- dodd dodi dodo doid doil dold doli doll dolo dolu doob dood dool door dord dori doro dorr doru doub doud doul dour drib dril drob drod drol drou drub drui druu dub- dubb dubu dudd dudo dudu duid duil duir duli dull dulo dulu duo- duri duro duru duul duur ibdo ibid ibrd ibri ibro iddo idid idil idio idir idli idol idro idub iduo iiii iiio iioi iioo ilio ilir ill- illd illi illo iloo ilud iobi iod- iodd iodo ioii ioio iolo iooi iooo iori irdo iri- irid iril irio irlb irob irod irri irul iuiu lblr libo libr libu lidb lidl lido liii liir lilb lili lill lilo lilu lio- liod lior lird liri lirl liro lirr liru lldb llll llod lloo llud lob- lobb lobi lobo lodi loid loir loiu lold loli loll lolo loob lood lool loor lord lori loro loud loui loul lour louu lrdd lroi lrrr ludd ludi ludo luli lull lulu lurd luri obbo obid oblu oboi obol obor obri obro odbo oddd oddi odio odir odiu odoo odor odou odrl odur oido oiii olbo oldb olib olid olio olli ollo olor olur oobi oodi ooid oold oolo oooo oord orbb orbi orbo orbu ordo ordu ori- orid oril orio orlo orlu oro- oror orri orro orub ouii ouir ould oulu our- ouro ouu- rbbb rbbr rdio rib- ribo ribu ridd ridi rido rill rilo rilu riol riou riri rob- robb robi robo robu rodd rodi rodo roid roil roio roir roiu rold roll rolo roob rood rooi rool roor rori roro roru roub roud roul rrrr rubb rubi rubu rudd rudi rudl rudo ruid rull rulo rurd ruri ruro ruru ruud ubbi ubbo ubid ubii ubir ubli ublo ubod ubud uddi udid udir udoo uirr ulli ullo ullr ulo- ulul uor- urbi urdu urib uriu uro- urol uroo urri urur uulu uuri uuuu