bbbb bbbs bcbc bcbs bccc bccs bcos bcsc bcss bobb bobo bobs bock boco bocs boko boks boob booc book boos bosc bosk boso boss bscs bsos bssc c-bo cbbc cbbs cbcc cbcs cbko cbsc ccbc cccb cccc cccs ccob ccoc ccss ckbc ckck ckco ckcs ckob ckoc ckoo ckos cksb ckso cobb cobo cobs cock coco cok- coko coob cook coos cosc coso coss cscb cscc csco cscs csks csob csos k-os kbbb kbbc kbbk kbbo kbbs kbcb kbck kbco kbcs kbkb kbkk kbko kbob kboc kbok kboo kbos kbsb kbsk kbso kbss kcbc kcbk kcbs kccb kccc kcck kckc kckk kcko kcob kcos kcsb kcsc kcss kkbb kkbo kkbs kkcb kkck kkco kkcs kkkk kkob kkoo kkss kobb kobc kobk kobo kobs kocb kock kocs kokb kokc kokk koko koks koob kooc kook kooo koos kos- kosb kosc koso koss ksbc ksbs kscb ksck ksco kscs kskb kskk ksko ksks ksob ksoc ksok ksoo ksos ksso ksss obbo obkb obok obos obss ocbc occc ocks ocos okko okok okso oooo ooos oscc osco osoo osos ossb osso s-os sbbs sbcc sbcs sccc sccs sck- scob scok scoo scsc scso skss sobo sobs sock soco socs sokk soko sook soos soso soss sscc sscs ssoc sssb sssc ssss