-er c-- ccc cce ccm ccn ccr ccs ce- cec cee cem cen cer ces cmc cme cmm cmn cmr cms cn- cnc cne cnm cnn cnr cns crc cre crm crn crr crs csc cse csm csn csr css ec- ecc ece ecm ecn ecr ecs eec eee eem een eer ees em- emc eme emm emn emr ems en- enc ene enm enn enr ens erc ere erm ern err ers es- esc ese esm esn esr ess m-r mc- mcc mce mcm mcn mcr mcs mec mee mem men mer mes mmc mme mmm mmn mmr mms mnc mne mnm mnn mnr mns mrc mre mrm mrn mrr mrs msc mse msm msn msr mss ncc nce ncm ncn ncr ncs ne- nec nee nem nen ner nes nmc nme nmm nmn nmr nms nnc nne nnm nnn nns nrc nre nrm nrn nrr nrs nsc nse nsm nsn nsr nss rcc rce rcm rcn rcr rcs re- rec ree rem ren rer res rmc rme rmm rmn rmr rms rnc rnm rnn rnr rns rrc rrm rrn rrr rrs rsc rse rsm rsn rsr rss scc sce scm scn scr scs se- sec see sem sen ser ses smc sme smm smn smr sms snc sne snm snn snr sns sr- src sre srm srn srr srs ss- ssc sse ssm ssn ssr sss