-er c-- ccc cce ccm ccn cco ccr ce- cec cee cem cen ceo cer cmc cme cmm cmn cmo cmr cn- cnc cne cnm cnn cno cnr co- coc coe com con coo cor crc cre crm crn cro crr ec- ecc ece ecm ecn eco ecr eec eee eem een eeo eer em- emc eme emm emn emo emr en- enc ene enm enn eno enr eo- eoc eoe eom eon eoo eor erc ere erm ern ero err m-o m-r mc- mcc mce mcm mcn mco mcr mec mee mem men meo mer mmc mme mmm mmn mmo mmr mnc mne mnm mnn mno mnr moc moe mom mon moo mor mrc mre mrm mrn mro mrr ncc nce ncm ncn nco ncr ne- nec nee nem nen neo ner nmc nme nmm nmn nmo nmr nnc nne nnm nnn nno no- noc noe nom non noo nor nrc nre nrm nrn nro nrr oc- occ ocm ocn oco ocr oec oee oem oen oeo oer om- omc ome omm omn omo omr on- onc one onn ono onr oo- ooc oom oon ooo oor or- orc ore orm orn oro orr rcc rce rcm rcn rco rcr re- rec ree rem ren reo rer rmc rme rmm rmn rmo rmr rnc rnm rnn rno rnr roc roe rom ron roo ror rrc rrm rrn rrr