c-- c-j ccc ccf ccj cck cco ccr ccs cfc cff cfk cfo cfr cfs cjc cjf cjk cjr cjs ckc cko cks co- coc cof coj cok coo cor cos crc crf crj crk cro crr crs csc csf csj csk cso csr css fcc fcf fcj fck fco fcr fcs ffc fff ffk ffo ffr ffs fjc fjs fkc fkf fkj fkk foc fof fok foo for fos frc frf frj frk fro frr frs fsc fsf fsj fsk fso fsr fss jcc jcf jck jco jcr jcs jfc jff jfj jfk jfo jfr jfs jjc jjf jjj jjk jjr jjs jkk jko jkr jks joc jof joj jok joo jor jos jrc jrf jrk jro jrr jrs jsc jsf jsj jsk jso jsr jss kcc kck kcr kcs kfc kff kfo kfs kjc kjr kjs kkc kkk kkr kks koc kof kok koo kor kos krc krf krk kro krr krs ksc ksf ksk kso ksr kss oc- occ ocf ocj ock oco ocr ocs of- ofc off ofo ofr ofs ojc ojo ojs okc okj okk oko okr oks oo- ooc oof ook ooo oor oos or- orc orf ork oro orr ors os- osc osf osj osk oso osr oss rcc rcf rcj rco rcr rcs rfc rff rfj rfk rfo rfr rfs rjc rjf rjk rjr rkc rkf rkk rko rks roc rof roj rok roo ror ros rrc rrf rrk rrr rrs rsc rsf rsj rsk rso rsr rss scc scf scj sck sco scr scs sfc sff sfj sfk sfo sfr sfs sjc sjf sjj sjk sjr sjs sk- skc skf skj skk sko skr sks soc sof soj sok soo sor sos sr- src srf srj srk sro srr srs ss- ssc ssf ssj ssk sso ssr sss