-er eee eeg eem eeo eer eex ege egg egm ego egr egx em- eme emg emm emo emr emx eo- eoe eog eom eoo eor ere erg erm ero err ex- exe exo exr exx ge- gee geg gem geo ger gex ggg ggm ggo ggr gme gmg gmm gmo gmr gmx goe gog gom goo gor gox gre grg grm gro grr grx m-o m-r mee meg mem meo mer mex mge mgm mgo mgr mgx mme mmg mmm mmo mmr mmx moe mog mom moo mor mox mre mrg mrm mro mrr mrx mxr oee oeg oem oeo oer oex oge ogg ogo ogx om- ome omg omm omo omr omx oo- oog oom ooo oor oox or- ore org orm oro orr orx ox- oxo oxx re- ree reg rem reo rer rex rge rgg rgo rgr rgx rme rmg rmm rmo rmr rmx roe rog rom roo ror rox rrg rrm rrr rxr xee xeg xem xer xex xge xmg xmm xmo xmr xmx xog xom xoo xor xox xrx xxo xxx