-er c-- ccc cce ccm ccn ccr ce- cec cee cem cen cer cmc cme cmm cmn cmr cn- cnc cne cnm cnn cnr crc cre crm crn crr ec- ecc ece ecm ecn ecr eec eee eem een eer em- emc eme emm emn emr en- enc ene enm enn enr erc ere erm ern err m-r mc- mcc mce mcm mcn mcr mec mee mem men mer mmc mme mmm mmn mmr mnc mne mnm mnn mnr mrc mre mrm mrn mrr ncc nce ncm ncn ncr ne- nec nee nem nen ner nmc nme nmm nmn nmr nnc nne nnm nnn nrc nre nrm nrn nrr rcc rce rcm rcn rcr re- rec ree rem ren rer rmc rme rmm rmn rmr rnc rnm rnn rnr rrc rrm rrn rrr