cccc cccs cccv ccoc ccrc ccrs ccss ccvo ccvs ckck ckco ckcs ckcv ckoc ckoo ckor ckos ckrc ckso ckvo cock coco cok- coko cook coos cor- corc cork coro corr cors cosc coso coss covo crcc crcr crkc croc crok croo cror crss cscc csco cscr cscs csks csor csos csrc csrs cssr cvcc cvrr cvss k-os kccc kcck kccr kccv kckc kckk kcko kckr kckv kcor kcos kcrc kcro kcrr kcrs kcrv kcsc kcsr kcss kcvk kcvo kcvr kcvs kcvv kkck kkco kkcr kkcs kkkk kkoo kkor kkov kkrc kkrk kkro kkrr kkrs kkrv kksr kkss kkvr kkvv kock kocs kokc kokk koko kokr koks kooc kook kooo koor koos koov korc kork koro korr kors korv kos- kosc koso kosr koss kovc kovk kovo kovr krcc krco krcs krkc krkk krko krkr krks krkv kroc krok kroo kror kros krov krrc krrk krro krrr krrs krsc krsk krsr krss krsv krvc krvk krvo krvr krvs krvv ksck ksco kscr kscs kscv kskk ksko kskr ksks ksoc ksok ksoo ksor ksos ksro ksrr ksrs ksrv ksso kssr ksss ksvc ksvr kvcc kvck kvco kvcr kvcs kvcv kvoc kvok kvoo kvor kvov kvrc kvro kvrr kvrv kvsc kvso kvsr kvss kvsv kvvr kvvs kvvv 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 orvr orvs oscc osco osoo osor osos osov osro osso ovcs ovo- ovoo rccc rccs rcos rcsc rcss rcvr rcvs rkos rkss rksv rocc rock roco rocs rokk roko rokr roks rook roor roos rorc rork roro rosc roso ross rovo rovs rrrr rscc rscs rsos rv-c s-os sccc sccs sck- scok scoo scor scr- scrc scrs scsc scso scsr skor skov skss sock soco socr socs sokk soko sook soor soos soro sorr sors soso soss sosv sovo sovs srcc sros sscc sscs ssoc ssrc ssrs sssc ssss svcc svcs svor svsc vcrs vkor voks vooc voor vor- voro vors voso voss vovk vroc vssc vvvv