bbbb bbbs bbrc bcbc bcbs bccc bccs bcrs bcru bcsc bcss bctc bcts bcuc brcb brkb brrr brrs brsb brsr brst brtc bruc brus brut bscs bskt bssc bsts btcc btcs btrc btrt btss bttb btus bubb bubs bubu bucc buck bucs bucu bukk buku bur- burb burk burr burs burt buru busc busk buss bust busu but- buts butt buus cbbc cbbs cbcc cbcr cbcs cbct cbcu cbkr cbrt cbsc cbtc cbus ccbc cccb cccc cccs cccu ccrc ccrs ccrt ccss ccst cctb cctc cctt ccuc ccus ccut ckbc ckck ckcs ckrc cksb ckst cktb ckts crbc crbu crcc crcr crkc crrt crss crst crtc crts crub cruk crus crut cscb cscc cscr cscs csks csrc csrs cssr cstc cstr csts csur csus ctbs ctrc ctrs ctsc ctss ctsu ctts cub- cubb cubs cucc cuck cuk- curb curr curs curt cusb cusk cuss cust cusu cut- cutc cuts cutt kbbb kbbc kbbk kbbr kbbs kbbt kbbu kbcb kbck kbcr kbcs kbct kbcu kbkb kbkk kbkr kbrb kbrc kbrk kbrt kbru kbsb kbsk kbsr kbss kbst kbsu kbtb kbtc kbtk kbtr kbts kbtt kbub kbuc kbuk kbur kbus kbut kbuu kcbc kcbk kcbr kcbs kcbu kccb kccc kcck kccr kcct kccu kckc kckk kckr kcrc kcrr kcrs kcrt kcru kcsb kcsc kcsr kcss kcst kcsu kctb kctc kctu kcub kcuk kkbb kkbr kkbs kkbt kkcb kkck kkcr kkcs kkct kkkk kkrb kkrc kkrk kkrr kkrs kkrt kksr kkss kkst kksu kktc kktk kkts kktu kkus kkut kkuu krbb krbk krbr krbt krcb krcc krcs krcu krkc krkk krkr krks krku krrb krrc krrk krrr krrs krrt krsc krsk krsr krss krst krsu krtc krtk krtr krts kruc kruk krur ksbc ksbr ksbs kscb ksck kscr kscs kscu kskb kskk kskr ksks ksku ksrb ksrr ksrs ksrt kssr ksss ksst kssu kstb kstc kstk kstr ksts kstt kstu ksub ksut ksuu ktbb ktbc ktbr ktbt ktbu ktcc ktck ktcr ktcs ktkb ktkc ktkk ktkr ktks ktkt ktku ktrb ktrc ktrk ktrr ktrs ktrt ktru ktsc ktsr ktst ktsu kttc kttk kttr ktts kttt kttu ktub ktuc kubb kubc kubr kubs kubu kucb kucc kucr kukk kuks kuku kurb kurk kurr kurs kurt kuru kusb kusc kust kusu kutr kuts kutt kutu kuub kuuk kuur kuuu rbbb rbbr rbbs rbss rbst rcbc rccb rccc rccs rcsc rcss rctc rcts rkss rkts rrrr rscc rscs rsts rstu rtcc rtss rtts rubb rubs rubu ruck ruct rukk ruku rurc rurs ruru rusk russ rust rusu ruts rutt rutu sbbs sbcc sbcs sbct sbrk sbst sbtc sbtk sbus sccc sccs scct sck- scr- scrc scrs scsc scsr scst scsu sctc sctr scts scub scur scut skrt skss skur skut srbc srcc srct srtr srub ssbr sscc sscs ssrc ssrs sssb sssc ssss sstb sstc ssts stbc stbs stcc stcs stcu stks strc strk strs stru stss sttc sttr stub stuc stuk stur stus stut sub- subb subs suc- succ suck sucr sucs suks suku sur- surc surr surs surt suru sus- susk suss sust susu sutu suus tbbs tbcb tbcc tbrb tbst tcbs tccc tccu tctc tcts tkts trcc trst trtc trtr trub truc truk trus trut truu tsbc tscc tsks tssr tsst tstc tsts ttbb ttss tttt tubb tubr tubs tubu tucc tuck tuks turb turc turk turr turs turt turu tusc tusk tuss tust tuts tutt tutu ucbc ucrc ucsb ucsc ucst ucsu ucut ukcc ukrc uksc ukur urbs urss ursu urts uruk urur urus urut us-k usbc usbr usbs uscc uscs ussb ussc ussr usss usst ussu ustb ustc usts usus utsc uttu uuuu