c-- ccc ccf cck ccm cco ccr ccs cfc cff cfk cfm cfo cfr cfs ckc ckm cko cks cmc cmf cmk cmm cmo cmr cms co- coc cof cok com coo cor cos crc crf crk crm cro crr crs csc csf csk csm cso csr css fcc fcf fck fcm fco fcr fcs ffc fff ffk ffm ffo ffr ffs fkc fkf fkk fkm fmc fmf fmm fmo fmr fms foc fof fok fom foo for fos frc frf frk frm fro frr frs fsc fsf fsk fsm fso fsr fss kcc kck kcm kcr kcs kfc kff kfm kfo kfs kkc kkk kkm kkr kks kmc kmf kmk kmm kmo kms koc kof kok kom koo kor kos krc krf krk kro krr krs ksc ksf ksk ksm kso ksr kss m-f m-o m-r mc- mcc mcf mck mcm mco mcr mcs mfc mff mfm mfo mfr mfs mkc mkk mkm mko mkr mks mmc mmf mmk mmm mmo mmr mms moc mof mok mom moo mor mos mrc mrf mrk mrm mro mrr mrs msc msf msk msm mso msr mss oc- occ ocf ock ocm oco ocr ocs of- ofc off ofm ofo ofr ofs okc okk oko okr oks om- omc omf omm omo omr oms oo- ooc oof ook oom ooo oor oos or- orc orf ork orm oro orr ors os- osc osf osk osm oso osr oss rcc rcf rcm rco rcr rcs rfc rff rfk rfm rfo rfr rfs rkc rkf rkk rkm rko rks rmc rmf rmm rmo rmr rms roc rof rok rom roo ror ros rrc rrf rrk rrm rrr rrs rsc rsf rsk rsm rso rsr rss scc scf sck scm sco scr scs sfc sff sfk sfm sfo sfr sfs sk- skc skf skk skm sko skr sks smc smf smk smm smo smr sms soc sof sok som soo sor sos sr- src srf srk srm sro srr srs ss- ssc ssf ssk ssm sso ssr sss