-er ddd dde ddg ddo ddr dds de- ded dee deg deo der des dgd dge dgg dgr dgs dod doe dog doo dor dos drd dre drg dro drr drs dsd dse dsg dso dsr dss ed- edd ede edg edo edr eds eed eee eeg eeo eer ees egd ege egg ego egr egs eo- eod eoe eog eoo eor eos erd ere erg ero err ers es- esd ese esg eso esr ess g-d gdd gde gdo gdr gds ge- ged gee geg geo ger ges ggd ggg ggo ggr ggs god goe gog goo gor gos grd gre grg gro grr grs gsd gse gsg gso gsr gss odd ode odg odo odr ods oed oee oeg oeo oer oes ogd oge ogg ogo ogs oo- ood oog ooo oor oos or- ord ore org oro orr ors os- osd ose osg oso osr oss rdd rde rdg rdo rdr rds re- red ree reg reo rer res rgd rge rgg rgo rgr rgs rod roe rog roo ror ros rrd rrg rrr rrs rsd rse rsg rso rsr rss sdd sde sdg sdo sdr sds se- sed see seg seo ser ses sgd sge sgg sgo sgr sgs sod soe sog soo sor sos sr- srd sre srg sro srr srs ss- ssd sse ssg sso ssr sss