-er ddd dde ddg ddo ddr ddu de- ded dee deg deo der deu dgd dge dgg dgr dgu dod doe dog doo dor dou drd dre drg dro drr dru dud due dug duo dur ed- edd ede edg edo edr edu eed eee eeg eeo eer egd ege egg ego egr egu eo- eod eoe eog eoo eor eou erd ere erg ero err eru eu- eud eue eug eur g-d gdd gde gdo gdr gdu ge- ged gee geg geo ger geu ggd ggg ggo ggr ggu god goe gog goo gor gou grd gre grg gro grr gru gu- gud gue gug guo gur guu odd ode odg odo odr odu oed oee oeg oeo oer ogd oge ogg ogo oo- ood oog ooo oor or- ord ore org oro orr oru ou- oud oue ouo our rdd rde rdg rdo rdr rdu re- red ree reg reo rer reu rgd rge rgg rgo rgr rod roe rog roo ror rou rrd rrg rrr rru rud rue rug ruo rur ruu udd ude udg udo udr udu ued uee ueg uer uge ugg ugo ugr ugu uod uoe uog uoo uor ur- urd ure urg uro urr uru uue uug uur uuu