-er c-- ccc cce cck ccm ccr ce- cec cee cek cem cer ckc ckm cmc cme cmk cmm cmr crc cre crk crm crr ec- ecc ece eck ecm ecr eec eee eek eem eer ekc eke ekr em- emc eme emk emm emr erc ere erk erm err kcc kce kck kcm kcr ke- kec kee kek kem ker kkc kke kkk kkm kkr kmc kme kmk kmm krc krk krr m-r mc- mcc mce mck mcm mcr mec mee mek mem mer mkc mke mkk mkm mkr mmc mme mmk mmm mmr mrc mre mrk mrm mrr rcc rce rcm rcr re- rec ree rek rem rer rkc rke rkk rkm rmc rme rmm rmr rrc rrk rrm rrr