bbbb bbbs bbrc bcbc bcbs bccc bccs bcor bcos bcrs bcsc bcss bobb bobo bobs bock boco bocs boko boks boob booc book boor boos bor- bork boro borr bors bosc bosk boso boss brcb brkb brob broc brok broo bror bros brrr brrs brsb brsr bscs bsos bssc c-bo cbbc cbbs cbcc cbcr cbcs cbko cbkr cbsc ccbc cccb cccc cccs ccob ccoc ccrc ccrs ccss ckbc ckck ckco ckcs ckob ckoc ckoo ckor ckos ckrc cksb ckso cobb cobo cobs cock coco cok- coko coob cook coos cor- corb corc cork coro corr cors cosc coso coss crbc crcc crcr crkc crob croc crok croo cror crss cscb cscc csco cscr cscs csks csob csor csos csrc csrs cssr k-os kbbb kbbc kbbk kbbo kbbr kbbs kbcb kbck kbco kbcr kbcs kbkb kbkk kbko kbkr kbob kboc kbok kboo kbos kbrb kbrc kbrk kbro kbsb kbsk kbso kbsr kbss kcbc kcbk kcbr kcbs kccb kccc kcck kccr kckc kckk kcko kckr kcob kcor kcos kcrc kcro kcrr kcrs kcsb kcsc kcsr kcss kkbb kkbo kkbr kkbs kkcb kkck kkco kkcr kkcs kkkk kkob kkoo kkor kkrb kkrc kkrk kkro kkrr kkrs kksr kkss kobb kobc kobk kobo kobr kobs kocb kock kocs kokb kokc kokk koko kokr koks koob kooc kook kooo koor koos korb korc kork koro korr kors kos- kosb kosc koso kosr koss krbb krbk krbr krcb krcc krco krcs krkc krkk krko krkr krks krob kroc krok kroo kror kros krrb krrc krrk krro krrr krrs krsc krsk krsr krss ksbc ksbr ksbs kscb ksck ksco kscr kscs kskb kskk ksko kskr ksks ksob ksoc ksok ksoo ksor ksos ksrb ksro ksrr ksrs ksso kssr ksss obbo obkb obok obor obos obro obsr obss ocbc occc ocks ocos ocro ocrr ocrs okko okok okor okro okso oocr oooo ooos orbb orbo orbs orco orcs orko oro- orok oror oros orro orrs orsk orso oscc osco osoo osor osos osro ossb osso rbbb rbbr rbbs rbss rcbc rcbo rccb rccc rccs rcos rcsc rcss rkos rkss rob- robb robo robs rocc rock roco rocs rokk roko rokr roks roob rook roor roos rorc rork roro rosc roso ross rrrr rscc rscs rsos s-os sbbs sbcc sbcs sbor sbrk sccc sccs sck- scob scok scoo scor scr- scrc scrs scsc scso scsr skor skss sobo sobr sobs sock soco socr socs sokk soko sook soor soos sorb soro sorr sors soso soss srbc srcc sros ssbr sscc sscs ssoc ssrc ssrs sssb sssc ssss