-er c-- ccc cce cck ccm ccr ccs ce- cec cee cek cem cer ces ckc ckm cks cmc cme cmk cmm cmr cms crc cre crk crm crr crs csc cse csk csm csr css ec- ecc ece eck ecm ecr ecs eec eee eek eem eer ees ekc eke ekr eks em- emc eme emk emm emr ems erc ere erk erm err ers es- esc ese esk esm esr ess kcc kce kck kcm kcr kcs ke- kec kee kek kem ker kes kkc kke kkk kkm kkr kks kmc kme kmk kmm kms krc krk krr krs ksc kse ksk ksm ksr kss m-r mc- mcc mce mck mcm mcr mcs mec mee mek mem mer mes mkc mke mkk mkm mkr mks mmc mme mmk mmm mmr mms mrc mre mrk mrm mrr mrs msc mse msk msm msr mss rcc rce rcm rcr rcs re- rec ree rek rem rer res rkc rke rkk rkm rks rmc rme rmm rmr rms rrc rrk rrm rrr rrs rsc rse rsk rsm rsr rss scc sce sck scm scr scs se- sec see sek sem ser ses sk- skc ske skk skm skr sks smc sme smk smm smr sms sr- src sre srk srm srr srs ss- ssc sse ssk ssm ssr sss