bbbb bbci bbrc bcbc bccc bcci bcit bcru bctc bcuc bibb bibi bicc bici birb biri birr birt biru biry bitc bitt bitu brcb bric brit brrr brtc bruc brut bry- btcc btrc btrt btry bttb bubb bubi bubu bucc buci bucu buic buir buit buiu bur- burb buri burr burt buru bury but- buti butt buty buyi buyu byit byrt cbbc cbcc cbcr cbct cbcu cbir cbit cbrt cbry cbtc cbyt ccbc cccb cccc ccci cccu ccic ccii ccir ccrc ccri ccrt cctb cctc cctt ccuc ccut cibc cibi cicc cici cicr cict cicu ciii ciit cirb circ ciri cirr cirt citb citi citt citu city ciuc ciyu crbc crbu crcc crcr crib cric crit criu crrt crtc crub crut cry- cryb ctbi ctic ctrc cub- cubb cubi cuby cucc cuci cui- cuir cuit curb curi curr curt cury cut- cutc cutt cuy- cuyr cybb cybc cybi cyc- cycb cycc cyrt cyt- cytb cyy- cyyc i-by ibrc ibri ibtb ibtc ibuy ibyi icbc iccb iccc icci iccr icct iccu icrc icrr icrt icru icry icub iiii iiit iirc iitr iitt iiuc irby ircc ircu iri- iric iriy irrc irri irti itby itic itri itry itty itur iucc iuiu iuty rbbb rbbr rcbc rccb rccc rcic rctc rcti rcyc rib- ribu riby ricc rict riri riti ritt ritu rrrr rtcc rubb rubi rubu ruby ruci ruct ruit rurc ruri ruru ruti rutt rutu ruty ruyi rytt ryyt tbcb tbcc tbit tbrb tcby tccc tccu tctc tibi tibu ticc tiit tiiu tirb tiri tirr tiru tiry titc titi titt titu tiyi trcc tri- trib tric trit trtc trtr trub truc trut truu try- tryb ttbb tttt tubb tubr tubu tucc tuit tuiu turb turc turi turr turt turu tury tuti tutt tutu tuty tybi tyir tyr- tyrr tyti tytt tyty ubbi ubic ubii ubir ubit ucbc ucci ucrc ucut uirr urbi urci urcy urib uric uriu urri urry urur urut utby utri utti uttu uuri uuuu uyir ybry yccc yctc yirb yirr yiti yubu yuit yuri yurt yury yutu yuty yuyu yyyy