bbbb bbbs bcbc bcbs bccc bccs bcos bcsc bcss bctc bcts bobb bobo bobs bock boco bocs boko boks boob booc book boos boot bosc bosk boso boss bost botb boto bots bott bscs bskt bsos bssc bsts btcc btcs btob btss bttb c-bo cbbc cbbs cbcc cbcs cbct cbko cbot cbsc cbtc ccbc cccb cccc cccs ccob ccoc ccss ccst cctb cctc cctt ckbc ckck ckco ckcs ckob ckoc ckoo ckos ckot cksb ckso ckst cktb ckts cobb cobo cobs cock coco coct cok- coko coob cook coos coot cosc coso coss cost cotb cotc coto cots cott cscb cscc csco cscs csks csob csos csot cstc csto csts ctbs ctos ctot ctsc ctss ctts k-os kbbb kbbc kbbk kbbo kbbs kbbt kbcb kbck kbco kbcs kbct kbkb kbkk kbko kbob kboc kbok kboo kbos kbot kbsb kbsk kbso kbss kbst kbtb kbtc kbtk kbto kbts kbtt kcbc kcbk kcbs kccb kccc kcck kcct kckc kckk kcko kcob kcos kcot kcsb kcsc kcss kcst kctb kctc kcto kkbb kkbo kkbs kkbt kkcb kkck kkco kkcs kkct kkkk kkob kkoo kkot kkss kkst kktc kktk kkts kobb kobc kobk kobo kobs kocb kock kocs koct kokb kokc kokk koko koks koob kooc kook kooo koos koot kos- kosb kosc koso koss kost kotb kotc kotk koto kots kott ksbc ksbs kscb ksck ksco kscs kskb kskk ksko ksks ksob ksoc ksok ksoo ksos ksso ksss ksst kstb kstc kstk ksto ksts kstt ktbb ktbc ktbt ktcc ktck ktco ktcs ktkb ktkc ktkk ktko ktks ktkt ktob ktoc ktok ktoo ktot ktsc ktso ktst kttc kttk ktto ktts kttt obbo obkb obok obos obot obss obst obts ocbc occc occt ocks ocos oct- octo octs okko okok okot okso okto oooo ooos oost ootb oots oscc osco osoo osos ossb osso ostc osts otbs oto- otok otoo otos otso otto otts s-os sbbs sbcc sbcs sbct sbot sbst sbtc sbtk sccc sccs scct sck- scob scok scoo scot scsc scso scst sctc scto scts skot skss sobo sobs sobt sock soco socs sokk soko sook soos soot soso soss sost sotc sotk soto sots sscc sscs ssoc ssot sssb sssc ssss sstb sstc ssts stbc stbs stcc stcs stks stob stok stoo stos stot stss sttc tbbs tbcb tbcc tbst tcbs tccc tcos tctc tcts tkos tkts tobo tobs tobt tock toco toko took toos toot tosb tosc tosk toso toss tost totc toto tots tott tsbc tscc tsks tsob tsos tsst tstc tsts ttbb ttss tttt