bbbb bbci bbdd bbrc bcbc bccc bcci bcru bcuc bd-r bdbc bddc bdii bibb bibi bicc bici bidi bidr bidu birb bird biri birr biru brcb bric brid brrr bruc brud bubb bubi bubu bucc buci bucu budb budd budi budu buic buid buir buiu bur- burb burd buri burr buru c-cd cbbc cbcc cbcr cbcu cbdb cbdc cbdi cbid cbir cbrd ccbc cccb cccc ccci cccu ccdc ccdi ccdr ccic ccid ccii ccir ccrc ccri ccuc cd-r cddb cddr cdic cdii cibc cibi cicc cici cicr cicu cidc cidi cidr ciid ciii cirb circ ciri cirr ciuc crbc crbu crcc crcr crdc crib cric criu crub crud cub- cubb cubi cucc cuci cudi cui- cuir curb curd curi curr dbcc dcbc dccb dccc dcci dccu dcdb dcii dddd ddrc ddub dibb dici didi didu diii dird dirr drbc drib dric drub drui druu dub- dubb dubc dubu dudd dudu duid duir duri duru duur ibid ibrc ibrd ibri icbc icbd iccb iccc icci iccr iccu icdc icdd icrc icrr icru icub idcr idic idid idir idrc idub iicd iiii iirc iiuc ircc ircd ircu irdc iri- iric irid irrc irri iucc iuiu rbbb rbbr rcbc rccb rccc rcdc rcic rcid rcrd rib- ribu ricc ridc ridd ridi riri rrrr rubb rubi rubu ruci rudd rudi ruid rurc rurd ruri ruru ruud ubbi ubic ubid ubii ubir ubud ucbc ucci ucdc ucdd ucrc udbc uddi udic udid udir uirr urbi urci urdu urib uric uriu urri urur uuri uuuu