-er c-- ccc cce ccg cck ccm cco ccr ce- cec cee ceg cek cem ceo cer cgc cge cgg cgm cgo cgr ckc ckm cko cmc cme cmg cmk cmm cmo cmr co- coc coe cog cok com coo cor crc cre crg crk crm cro crr ec- ecc ece ecg eck ecm eco ecr eec eee eeg eek eem eeo eer egc ege egg egm ego egr ekc eke ekg eko ekr em- emc eme emg emk emm emo emr eo- eoc eoe eog eok eom eoo eor erc ere erg erk erm ero err gcc gce gcg gck gcm gco gcr ge- gec gee geg gek gem geo ger ggc ggg ggm ggo ggr gkm gko gmc gme gmg gmm gmo gmr goc goe gog gok gom goo gor grc gre grg grk grm gro grr kcc kce kcg kck kcm kcr ke- kec kee keg kek kem keo ker kgc kgm kgo kkc kke kkk kkm kkr kmc kme kmg kmk kmm kmo koc koe kog kok kom koo kor krc krg krk kro krr m-o m-r mc- mcc mce mcg mck mcm mco mcr mec mee meg mek mem meo mer mgc mge mgk mgm mgo mgr mkc mke mkg mkk mkm mko mkr mmc mme mmg mmk mmm mmo mmr moc moe mog mok mom moo mor mrc mre mrg mrk mrm mro mrr oc- occ ocg ock ocm oco ocr oec oee oeg oem oeo oer ogc oge ogg ogo okc oke okg okk oko okr om- omc ome omg omm omo omr oo- ooc oog ook oom ooo oor or- orc ore org ork orm oro orr rcc rce rcg rcm rco rcr re- rec ree reg rek rem reo rer rgc rge rgg rgk rgo rgr rkc rke rkg rkk rkm rko rmc rme rmg rmm rmo rmr roc roe rog rok rom roo ror rrc rrg rrk rrm rrr