bbbb bbci bbdd bbrc bcbc bccc bcci bcit bcru bctc bcuc bd-r bdbc bddc bdii bibb bibi bicc bici bidi bidr bidu birb bird biri birr birt biru bitc bitd bitt bitu brcb brdt bric brid brit brrr brtc bruc brud brut btcc btdt btrc btrt bttb bubb bubi bubu bucc buci bucu budb budd budi budu buic buid buir buit buiu bur- burb burd buri burr burt buru but- buti butt c-cd cbbc cbcc cbcr cbct cbcu cbdb cbdc cbdi cbid cbir cbit cbrd cbrt cbtc ccbc cccb cccc ccci cccu ccdc ccdi ccdr ccic ccid ccii ccir ccrc ccri ccrt cctb cctc cctt ccuc ccut cd-r cddb cddr cdic cdii cibc cibi cicc cici cicr cict cicu cidc cidi cidr cidt ciid ciii ciit cirb circ ciri cirr cirt citb citi citt citu ciuc crbc crbu crcc crcr crdc crib cric crit criu crrt crtc crub crud crut ctbi ctic ctrc cub- cubb cubi cucc cuci cudi cui- cuir cuit curb curd curi curr curt cut- cutc cutt dbcc dbit dbtt dcbc dccb dccc dcci dcct dccu dcdb dcii dctc dddd ddrc ddub dibb dici dict didi didu diii dird dirr dirt diti ditt drbc drib dric drit drub drui drut druu dtcc dub- dubb dubc dubu duct dudd dudu duid duir duit duri durt duru duur duut ibid ibrc ibrd ibri ibtb ibtc icbc icbd iccb iccc icci iccr icct iccu icdc icdd icrc icrr icrt icru icub idcr idic idid idir idrc idub iicd iiii iiit iirc iitr iitt iiuc ircc ircd ircu irdc iri- iric irid irrc irri irti itic itri itur iucc iuiu rbbb rbbr rcbc rccb rccc rcdc rcic rcid rcrd rctc rcti rib- ribu ricc rict ridc ridd ridi riri riti ritt ritu rrrr rtcc rtdt rubb rubi rubu ruci ruct rudd rudi ruid ruit rurc rurd ruri ruru ruti rutt rutu ruud tbcb tbcc tbcd tbit tbrb tccc tccu tcdd tctc tddb tdri tibi tibu ticc tidc tidd tiit tiiu tirb tird tiri tirr tiru titc titi titt titu trcc tri- trib tric trit trtc trtr trub truc trud trut truu ttbb tttt tubb tubr tubu tucc tudi tudu tuit tuiu turb turc turd turi turr turt turu tuti tutt tutu ubbi ubic ubid ubii ubir ubit ubud ucbc ucci ucdc ucdd ucrc ucut udbc uddi udic udid udir uirr urbi urci urdu urib uric uriu urri urur urut utid utri utti uttu uuri uuuu