-er c-- ccc cce ccm ccr ccs ce- cec cee cem cer ces cmc cme cmm cmr cms crc cre crm crr crs csc cse csm csr css ec- ecc ece ecm ecr ecs eec eee eem eer ees em- emc eme emm emr ems erc ere erm err ers es- esc ese esm esr ess m-r mc- mcc mce mcm mcr mcs mec mee mem mer mes mmc mme mmm mmr mms mrc mre mrm mrr mrs msc mse msm msr mss rcc rce rcm rcr rcs re- rec ree rem rer res rmc rme rmm rmr rms rrc rrm rrr rrs rsc rse rsm rsr rss scc sce scm scr scs se- sec see sem ser ses smc sme smm smr sms sr- src sre srm srr srs ss- ssc sse ssm ssr sss