bbbb bblb bbrc bcbc bccc bccl bcru bcuc blcu blkb blrc blub blur brcb brkb brrr bruc bubb bubu bucc buck bucu bukk buku bulb bulk bull bulu bur- burb burk burl burr buru cbbc cbcc cbcl cbcr cbcu cbkl cbkr cblb cblc cbrl ccbc cccb cccc cccl cccu cclc ccrc ccrl ccuc ckbc ckck ckcl ckrc club crbc crbu crcc crcr crkc crkl crub cruk cub- cubb cucc cuck cuk- culb culc culk cull curb curl curr kbbb kbbc kbbk kbbl kbbr kbbu kbcb kbck kbcl kbcr kbcu kbkb kbkk kbkl kbkr kblb kbll kblr kblu kbrb kbrc kbrk kbrl kbru kbub kbuc kbuk kbul kbur kbuu kcbc kcbk kcbl kcbr kcbu kccb kccc kcck kccl kccr kccu kckc kckk kckl kckr kclc kclk kcll kclr kclu kcrc kcrr kcru kcub kcuk kcul kkbb kkbl kkbr kkcb kkck kkcl kkcr kkkk kklb kklc kkll kkrb kkrc kkrk kkrl kkrr kkuu klbb klbc klbl klbu klcb klcc klck klcl klcr klkc klkk klkl klkr kllb kllc kllk klrc klrk klrr klru klub kluk klur kluu krbb krbk krbl krbr krcb krcc krcl krcu krkc krkk krkr krku krlc krrb krrc krrk krrl krrr kruc kruk krul krur kubb kubc kubr kubu kucb kucc kucr kukk kukl kuku kulb kull kulu kurb kurk kurl kurr kuru kuub kuuk kuul kuur kuuu lbcc lblr lcbc lccc lcrl llcc lllc llll lrrc lrrr luck lull lulu lurk luuk rbbb rbbr rbcl rcbc rccb rccc rrrr rubb rubu ruck rukk ruku rulk rull rurc ruru ucbc ucrc ukcc ukrc ukur ulbc ulcc ullr uluk ulul uruk urur uulu uuuu