bbbb bbdd bd-r bdii bdry bibb bibi bidi bidr bidu birb bird biri birr biru biry brdy brid brrr brud bry- bryd bubb bubi bubu budb budd budi budu budy buid buir buiu bur- burb burd buri burr buru bury buyi buyu byrd byyd dddd ddry ddub dibb diby didi didu didy diii dird dirr diyi diyu drib drub drui druu dry- dub- dubb dubu duby dudd dudu duid duir duri duru dury duur duyr dybu dydd dyr- dyrb dyri dyru dyur dyyr i-by ibid ibrd ibri ibuy ibyi idid idir idub iiii irby iri- irid iriy irri iuiu rbbb rbbr rib- ribu riby ridd ridi riri rrrr rubb rubi rubu ruby rudd rudi rudy ruid rurd ruri ruru ruud ruyd ruyi rydy ubbi ubid ubii ubir ubud uddi udid udir uirr urbi urdu urdy urib uriu urri urry urur uuri uuuu uyir ybry yidi yidu yirb yird yirr yiud yubu yudu yurd yuri yury yuyu yyyy