c-- ccc cck cco ccr ccs ccv ckc cko cks co- coc cok coo cor cos cov crc crk cro crr crs crv csc csk cso csr css csv cvc cvk cvo cvr cvs cvv kcc kck kcr kcs kkc kkk kkr kks kkv koc kok koo kor kos krc krk kro krr krs krv ksc ksk kso ksr kss ksv kvk kvo kvr kvs kvv oc- occ ock oco ocr ocs ocv okc okk oko okr oks oo- ooc ook ooo oor oos oov or- orc ork oro orr ors orv os- osc osk oso osr oss osv ov- ovc ovo ovs ovv rcc rco rcr rcs rcv rkc rkk rko rks rkv roc rok roo ror ros rov rrc rrk rrr rrs rsc rsk rso rsr rss rsv rvc rvo rvr rvs rvv scc sck sco scr scs scv sk- skc skk sko skr sks soc sok soo sor sos sov sr- src srk sro srr srs srv ss- ssc ssk sso ssr sss ssv svc svk svo svr svs svv vcc vco vcr vcs voc vok voo vor vos vov vrc vrk vrr vrs vsc vsk vso vsr vss vsv vvc vvo vvr vvs vvv