bbbb bbci bbrc bcbc bccc bcci bcit bcru bctc bcuc bibb bibi bicc bici bick biku birb biri birk birr birt biru bitc bitt bitu brcb bric brik brit brkb brrr brtc bruc brut btcc btrc btrt bttb bubb bubi bubu bucc buci buck bucu buic buik buir buit buiu buki bukk buku bur- burb buri burk burr burt buru but- buti butt cbbc cbcc cbcr cbct cbcu cbir cbit cbkr cbrt cbtc 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 cikr cirb circ ciri cirk cirr cirt citb citi citt citu ciuc ckbc ckbi ckck ckrc cktb crbc crbu crcc crcr crib cric crik crit criu crkc crrt crtc crub cruk crut ctbi ctic ctrc cub- cubb cubi cucc cuci cuck cui- cuir cuit cuk- curb curi curr curt cut- cutc cutt ibrc ibri ibtb ibtc icbc iccb iccc icci iccr icct iccu icrc icrr icrt icru icub iiii iiit iirc iitr iitt iiuc ikki ikri ircc ircu iri- iric irki irrc irri irti itic itri itur iucc iuiu k-ci kbbb kbbc kbbi kbbk kbbr kbbt kbbu kbcb kbci kbck kbcr kbct kbcu kbib kbic kbik kbit kbiu kbkb kbkk kbkr kbrb kbrc kbri kbrk kbrt kbru kbtb kbtc kbtk kbtr kbtt kbub kbuc kbuk kbur kbut kbuu kcbc kcbi kcbk kcbr kcbu kccb kccc kcci kcck kccr kcct kccu kcic kcii kcir kcit kciu kckc kckk kckr kcrc kcri kcrr kcrt kcru kctb kctc kcti kctu kcub kcui kcuk kibb kibc kibi kibr kibt kibu kicb kicc kick kicr kict kiic kiii kiik kiit kiiu kikc kiki kikk kikr kikt kiku kirb kirc kiri kirk kirr kirt kiru kitc kiti kitr kitt kitu kiur kiuu kkbb kkbi kkbr kkbt kkcb kkci kkck kkcr kkct kkic kkik kkit kkkk kkrb kkrc kkrk kkrr kkrt kktc kktk kktu kkut kkuu krbb krbi krbk krbr krbt krcb krcc krci krcu krib krik krit krkc krki krkk krkr krku krrb krrc krri krrk krrr krrt krtc krti krtk krtr kruc krui kruk krur ktbb ktbc ktbr ktbt ktbu ktcc ktck ktcr ktib ktic ktik ktkb ktkc ktkk ktkr ktkt ktku ktrb ktrc ktri ktrk ktrr ktrt ktru kttc ktti kttk kttr kttt kttu ktub ktuc ktui kubb kubc kubr kubu kucb kucc kuci kucr kuic kuik kuki kukk kuku kurb kuri kurk kurr kurt kuru kuti kutr kutt kutu kuub kuuk kuur kuuu rbbb rbbr rcbc rccb rccc rcic rctc rcti rib- ribu ricc rick rict riki rikk riku riri riti ritt ritu rrrr rtcc rubb rubi rubu ruci ruck ruct ruit ruki rukk ruku rurc ruri ruru ruti rutt rutu tbcb tbcc tbit tbrb tccc tccu tctc tibi tibu ticc tick tiit tiiu tiki tiku tirb tiri tirr tiru titc titi titt titu trcc tri- trib tric trik trit trtc trtr trub truc truk trut truu ttbb tttt tubb tubr tubu tucc tuck tuik tuit tuiu turb turc turi turk turr turt turu tuti tutt tutu ubbi ubic ubii ubik ubir ubit ucbc ucci ucrc ucut uirr ukcc ukrc ukur urbi urci urib uric urik uriu urri uruk urur urut utik utri utti uttu uuri uuuu