-er ddd dde ddf ddg ddo ddr de- ded dee def deg deo der dfd dfe dff dfg dfo dfr dgd dge dgf dgg dgr dod doe dof dog doo dor drd dre drg dro drr ed- edd ede edf edg edo edr eed eee eef eeg eeo eer ef- efd efe eff efg efo efr egd ege egf egg ego egr eo- eod eoe eof eog eoo eor erd ere erf erg ero err fdd fde fdf fdg fdo fdr fed fee fef feg feo fer ffd ffe fff ffg ffo ffr fgd fge fgf fgg fgr foe fof fog foo for frd fre frf frg fro frr g-d gdd gde gdf gdo gdr ge- ged gee gef geg geo ger gfd gfe gff gfo gfr ggd ggg ggo ggr god goe gof gog goo gor grd gre grf grg gro grr odd ode odf odg odo odr oed oee oef oeg oeo oer of- ofd ofe off ofg ofo ofr ogd oge ogf ogg ogo oo- ood oof oog ooo oor or- ord ore orf org oro orr rdd rde rdf rdg rdo rdr re- red ree ref reg reo rer rfd rfe rff rfg rfo rfr rgd rge rgf rgg rgo rgr rod roe rof rog roo ror rrd rrf rrg rrr