c-- c-j ccc ccj cck cco ccr ccs cjc cjk cjr cjs ckc cko cks co- coc coj cok coo cor cos crc crj crk cro crr crs csc csj csk cso csr css jcc jck jco jcr jcs jjc jjj jjk jjr jjs jkk jko jkr jks joc joj jok joo jor jos jrc jrk jro jrr jrs jsc jsj jsk jso jsr jss kcc kck kcr kcs kjc kjr kjs kkc kkk kkr kks koc kok koo kor kos krc krk kro krr krs ksc ksk kso ksr kss oc- occ ocj ock oco ocr ocs ojc ojo ojs okc okj okk oko okr oks oo- ooc ook ooo oor oos or- orc ork oro orr ors os- osc osj osk oso osr oss rcc rcj rco rcr rcs rjc rjk rjr rkc rkk rko rks roc roj rok roo ror ros rrc rrk rrr rrs rsc rsj rsk rso rsr rss scc scj sck sco scr scs sjc sjj sjk sjr sjs sk- skc skj skk sko skr sks soc soj sok soo sor sos sr- src srj srk sro srr srs ss- ssc ssj ssk sso ssr sss