bbbb bftt bibb bibi biff bifi birb biri birr birt biru biry bitt bitu brfu brit brrr brut bry- btrt btry bttb bubb bubi bubu buff bufr buif buir buit buiu bur- burb buri burr burt buru bury but- buti butt buty buyi buyu byit byrt ffff ffii ffrr fftf fiff fifi fift fiii firy fiti fitt frib frit frub ftfy ftii ftub fubb fubu fuff fufu fuir fuit fur- furi furr furt fury futi futu fuyt fuyu fyfi fyry fyti i-by ibfi ibri ibtb ibuy ibyi ifbb ifby iffy ifit ifrb ifrf ifri iiii iiit iitr iitt irby irfu iri- iriy irri irtf irti itby itif itrf itri itry ittf itty itur iuiu iuty rbbb rbbr rib- ribu riby riff rift rifu riif riri riti ritt ritu riyf rrif rrrr rtbf rtfb rubb rubi rubu ruby ruff ruft ruif ruit ruri ruru ruti rutt rutu ruty ruyi ryff ryft ryif rytt ryyf ryyt tbit tbrb tbyf tibi tibu tiff tift tiit tiiu tirb tiri tirr tiru tiry titi titt titu tiyi trfr tri- trib trif trit trtr trub trut truu try- tryb ttbb ttff tttt tubb tubr tubu tuff tufi tuft tufu tuit tuiu turb turf turi turr turt turu tury tuti tutt tutu tuty tybi tyff tyft tyir tyr- tyrf tyrr tyti tytt tyty ubbi ubii ubir ubit ubtf uirr urbi urff urfi urft urib urif uriu urri urry urur urut utby utri utti uttu uuri uutf uuuu uyir ybry yiff yift yirb yirr yiti yubu yuff yuft yufu yuit yuri yurt yury yutu yuty yuyu yyff yyyy