bbbb bbdd bblb bd-r bdii bduf bffl bibb bibi bibl bidi bidr bidu biff bifi bild bili bill bilu birb bird biri birl birr biru bldr blir blub blud bluf blur brfu brid bril brrr brud bubb bubi bubu budb budd budi budl budu buff bufr buid buif buir buiu bulb buld buli bull bulu bur- burb burd buri burl burr buru dddd ddub dfrf dfri dibb didi didu dif- diff diii dilf dili dill dird dirl dirr dlbd dlib dlii dlil drib drif dril drub drui druu dub- dubb dubu dudd dudu duff dufu duid duif duil duir duli dull dulu duri duru duul duur fdlr ffff ffii ffrr fidf fiff fifi fiii fiil fild fili fill fldr flid flii flub flud fluf flur frib frid fril frub fubb fubu fudd fudi fuff fufu fuid fuil fuir fuli full fulu fur- furi furl furr ibfi ibid ibrd ibri idid idil idir idli idrf idub ifbb ifid ifil ifrb ifrf ifri iiii ilir ill- illd illi ilud irfu iri- irid iril irlb irri irul iuiu lblr ldif lfrd libr libu lidb lidl liff lifl liii liir lilb lili lill lilu lird liri lirl lirr liru liuf lldb llll llud lrdd lrif lrrr ludd ludi luff lufu luif luli lull lulu lurd luri rbbb rbbr rfdi rffl rfid rib- ribu ridd ridi riff rifu riif rill rilu riri rlif rrif rrrr rubb rubi rubu rudd rudi rudl ruff ruid ruif rull rurd ruri ruru ruud ubbi ubid ubii ubir ubli ubud uddi udid udir uirr ulli ullr ulul urbi urdu urff urfi urib urif uriu urri urur uulu uuri uuuu