-er ddd dde ddg ddo ddr dds ddu de- ded dee deg deo der des deu dgd dge dgg dgr dgs dgu dod doe dog doo dor dos dou drd dre drg dro drr drs dru dsd dse dsg dso dsr dss dsu dud due dug duo dur dus ed- edd ede edg edo edr eds edu eed eee eeg eeo eer ees egd ege egg ego egr egs egu eo- eod eoe eog eoo eor eos eou erd ere erg ero err ers eru es- esd ese esg eso esr ess esu eu- eud eue eug eur eus g-d gdd gde gdo gdr gds gdu ge- ged gee geg geo ger ges geu ggd ggg ggo ggr ggs ggu god goe gog goo gor gos gou grd gre grg gro grr grs gru gsd gse gsg gso gsr gss gsu gu- gud gue gug guo gur gus guu odd ode odg odo odr ods odu oed oee oeg oeo oer oes ogd oge ogg ogo ogs oo- ood oog ooo oor oos or- ord ore org oro orr ors oru os- osd ose osg oso osr oss osu ou- oud oue ouo our ous rdd rde rdg rdo rdr rds rdu re- red ree reg reo rer res reu rgd rge rgg rgo rgr rgs rod roe rog roo ror ros rou rrd rrg rrr rrs rru rsd rse rsg rso rsr rss rsu rud rue rug ruo rur rus ruu sdd sde sdg sdo sdr sds sdu se- sed see seg seo ser ses seu sgd sge sgg sgo sgr sgs sgu sod soe sog soo sor sos sou sr- srd sre srg sro srr srs ss- ssd sse ssg sso ssr sss ssu sud sue sug suo sur sus suu udd ude udg udo udr uds udu ued uee ueg uer ues uge ugg ugo ugr ugs ugu uod uoe uog uoo uor uos ur- urd ure urg uro urr urs uru usd use usg uso usr uss usu uue uug uur uus uuu