-er c-- ccc cce ccg ccm cco ccr ce- cec cee ceg cem ceo cer cgc cge cgg cgm cgo cgr cmc cme cmg cmm cmo cmr co- coc coe cog com coo cor crc cre crg crm cro crr ec- ecc ece ecg ecm eco ecr eec eee eeg eem eeo eer egc ege egg egm ego egr em- emc eme emg emm emo emr eo- eoc eoe eog eom eoo eor erc ere erg erm ero err gcc gce gcg gcm gco gcr ge- gec gee geg gem geo ger ggc ggg ggm ggo ggr gmc gme gmg gmm gmo gmr goc goe gog gom goo gor grc gre grg grm gro grr m-o m-r mc- mcc mce mcg mcm mco mcr mec mee meg mem meo mer mgc mge mgm mgo mgr mmc mme mmg mmm mmo mmr moc moe mog mom moo mor mrc mre mrg mrm mro mrr oc- occ ocg ocm oco ocr oec oee oeg oem oeo oer ogc oge ogg ogo om- omc ome omg omm omo omr oo- ooc oog oom ooo oor or- orc ore org orm oro orr rcc rce rcg rcm rco rcr re- rec ree reg rem reo rer rgc rge rgg rgo rgr rmc rme rmg rmm rmo rmr roc roe rog rom roo ror rrc rrg rrm rrr