cccc cccs ccoc ccrc ccrs ccss ckck ckco ckcs ckoc ckoo ckor ckos ckrc ckso cock coco cok- coko cook coos cor- corc cork coro corr cors cosc coso coss crcc crcr crkc croc crok croo cror crss cscc csco cscr cscs csks csor csos csrc csrs cssr k-os kccc kcck kccr kckc kckk kcko kckr kcor kcos kcrc kcro kcrr kcrs kcsc kcsr kcss kkck kkco kkcr kkcs kkkk kkoo kkor kkrc kkrk kkro kkrr kkrs kksr kkss kock kocs kokc kokk koko kokr koks kooc kook kooo koor koos korc kork koro korr kors kos- kosc koso kosr koss krcc krco krcs krkc krkk krko krkr krks kroc krok kroo kror kros krrc krrk krro krrr krrs krsc krsk krsr krss ksck ksco kscr kscs kskk ksko kskr ksks ksoc ksok ksoo ksor ksos ksro ksrr ksrs ksso kssr ksss occc ocks ocos ocro ocrr ocrs okko okok okor okro okso oocr oooo ooos orco orcs orko oro- orok oror oros orro orrs orsk orso oscc osco osoo osor osos osro osso rccc rccs rcos rcsc rcss rkos rkss rocc rock roco rocs rokk roko rokr roks rook roor roos rorc rork roro rosc roso ross rrrr rscc rscs rsos s-os sccc sccs sck- scok scoo scor scr- scrc scrs scsc scso scsr skor skss sock soco socr socs sokk soko sook soor soos soro sorr sors soso soss srcc sros sscc sscs ssoc ssrc ssrs sssc ssss