bbbb bbdd bbdo bbeb bbet bd-r bebb bebe bebo bede bedo bedu beeb beed beer beet beo- beod beor beot berd bere bero berr bert beru bete beto bett betu beur bobb bobe bobo bobu bodb bode bodo bodu boee boeo boer boet boob bood booe boor boot bor- bord bore boro borr bort boru botb botd bote boto bott boud boue bour bout brdo brdt breb bred bree breo brer bret brob brod broe broo bror brot brou brrr brud brue brut btdt btob btor btrt bttb bubb bube bubo bubu budb budd bude budo budu buer bueu bur- burb burd bure buro burr burt buru but- bute buto butt d-bo dbtt dddd ddot ddre ddub debe debt debu dedd dede dedo dedu deeb deed deer deet deor der- derb dere dero derr dete deto detr deue deur deut dobb dobe dobu dod- dodd dode dodo doer doob dood door doot dord dore doro dorr dort doru dotd dote doto dott doub doud doue dour dout dred dree dret drob drod drot drou drub drue drut druu dted dtor dtot dub- dubb dube dubu dudd dude dudo dudu duer duet duo- dure duro durt duru dute duur duut ebbo ebbr ebed eber eboe eboo ebor ebro ebru ebur edde eddo ede- eder edod edou edru edur eede eedu eeee eero eete eetu eode eore eotd eoto erbb erbe erde ereb ered erer eret erob erod eroe eroo erre erro ertu erub erur etbr etee eter etoe etre etro ette etto ettu eude euer eur- eure euro eurt o-eo obbo obdt obed ober obet oboe obor obot obre obro obtd odbo oddd oded odeo oder odet odoo odor odot odou odtu odur oedo oere oobe ooer oooo oord oore oort ootb orbb orbe orbo orbu orde ordo ordu ore- oreb ored oreo orer oro- oroe oror orot orro orte orto orub otbd oted otee oter oto- otoe otoo otor otre otro otte otto ottu otur oude oued ouer our- oure ouro ourt out- outb oute outo ouu- rbbb rbbr rder rebb rebe rebo rebu redd rede redo redr redu reeb reed reet reod reot reou rerd rere rero rert reru retd rete reto retr rett reue reut reuu rob- robb robe robo robt robu rodd rode rodo roed roer roet roob rood roor root rore roro rort roru rote roto rotr rott roub roud roue rout rred rrrr rtdt rtee rubb rube rubu rudd rude rudo rued ruer ruet rurd rure ruro ruru rute ruto rutt rutu ruud tbrb tddb tdor tebo tebu tedd tede teed teer teet teor ter- tere tero terr teru tete teto tetr tett tetu teut tobe tobo tobt tobu todd tode todo todt todu toed toee toer toet tood toor toot tord tore toro torr tort toru totd tote toto totr tott tour tout tre- tred tree treo tret treu trod troe troo trot trou trte trtr trub trud true trut truu ttbb tteo tter ttoe tttt tubb tube tubo tubr tubu tude tudu tuer tuet tuor turb turd ture turo turr turt turu tute tuto tutt tutu tuuo ubbe ubbo uber ubet ubod ubud uder udet udoo udot uor- uore urbe urde urdu ure- ured uret uro- uroo urre urte urur urut uter utor utto uttu uuuu