bbbb bbbs bcbc bcbs bccc bccs bcsc bcss bcuc bscs bssc bubb bubs bubu bucc buck bucs bucu bukk buku busc busk buss busu buus cbbc cbbs cbcc cbcs cbcu cbsc cbus ccbc cccb cccc cccs cccu ccss ccuc ccus ckbc ckck ckcs cksb cscb cscc cscs csks csus cub- cubb cubs cucc cuck cuk- cusb cusk cuss cusu kbbb kbbc kbbk kbbs kbbu kbcb kbck kbcs kbcu kbkb kbkk kbsb kbsk kbss kbsu kbub kbuc kbuk kbus kbuu kcbc kcbk kcbs kcbu kccb kccc kcck kccu kckc kckk kcsb kcsc kcss kcsu kcub kcuk kkbb kkbs kkcb kkck kkcs kkkk kkss kksu kkus kkuu ksbc ksbs kscb ksck kscs kscu kskb kskk ksks ksku ksss kssu ksub ksuu kubb kubc kubs kubu kucb kucc kukk kuks kuku kusb kusc kusu kuub kuuk kuuu sbbs sbcc sbcs sbus sccc sccs sck- scsc scsu scub skss sscc sscs sssb sssc ssss sub- subb subs suc- succ suck sucs suks suku sus- susk suss susu suus ucbc ucsb ucsc ucsu ukcc uksc us-k usbc usbs uscc uscs ussb ussc usss ussu usus uuuu