bbbb bbci bcbc bccc bcci bcit bctc bcuc bibb bibi bicc bici bick biku bitc bitt bitu btcc bttb bubb bubi bubu bucc buci buck bucu buic buik buit buiu buki bukk buku but- buti butt cbbc cbcc cbct cbcu cbit cbtc ccbc cccb cccc ccci cccu ccic ccii cctb cctc cctt ccuc ccut cibc cibi cicc cici cict cicu ciii ciit citb citi citt citu ciuc ckbc ckbi ckck cktb ctbi ctic cub- cubb cubi cucc cuci cuck cui- cuit cuk- cut- cutc cutt ibtb ibtc icbc iccb iccc icci icct iccu icub iiii iiit iitt iiuc ikki itic iucc iuiu k-ci kbbb kbbc kbbi kbbk kbbt kbbu kbcb kbci kbck kbct kbcu kbib kbic kbik kbit kbiu kbkb kbkk kbtb kbtc kbtk kbtt kbub kbuc kbuk kbut kbuu kcbc kcbi kcbk kcbu kccb kccc kcci kcck kcct kccu kcic kcii kcit kciu kckc kckk kctb kctc kcti kctu kcub kcui kcuk kibb kibc kibi kibt kibu kicb kicc kick kict kiic kiii kiik kiit kiiu kikc kiki kikk kikt kiku kitc kiti kitt kitu kiuu kkbb kkbi kkbt kkcb kkci kkck kkct kkic kkik kkit kkkk kktc kktk kktu kkut kkuu ktbb ktbc ktbt ktbu ktcc ktck ktib ktic ktik ktkb ktkc ktkk ktkt ktku kttc ktti kttk kttt kttu ktub ktuc ktui kubb kubc kubu kucb kucc kuci kuic kuik kuki kukk kuku kuti kutt kutu kuub kuuk kuuu tbcb tbcc tbit tccc tccu tctc tibi tibu ticc tick tiit tiiu tiki tiku titc titi titt titu ttbb tttt tubb tubu tucc tuck tuik tuit tuiu tuti tutt tutu ubbi ubic ubii ubik ubit ucbc ucci ucut ukcc utik utti uttu uuuu