-er eee eeg eeo eer eex ege egg egi ego egr egx eie eig eii eio eir eix eo- eoe eog eoi eoo eor ere erg eri ero err ex- exe exi exo exr exx ge- gee geg gei geo ger gex ggg ggi ggo ggr gie gig gii gio gir goe gog goi goo gor gox gre grg gri gro grr grx ie- iee ieg iei ier iex ige igg igi igo igr iie iii iio iir iix io- ioe iog ioi ioo ior ir- ire irg iri iro irr irx ixe ixi o-i oee oeg oei oeo oer oex oge ogg ogi ogo ogx oie oii oio oir oo- oog ooi ooo oor oox or- ore org ori oro orr orx ox- oxi oxo oxx re- ree reg rei reo rer rex rge rgg rgi rgo rgr rgx rie rig rii rio rir rix roe rog roi roo ror rox rrg rri rrr rxr xee xeg xer xex xge xgi xie xii xio xix xog xoi xoo xor xox xrx xxi xxo xxx