-er ddd dde ddg ddk ddo ddr dds de- ded dee deg dek deo der des dgd dge dgg dgk dgr dgs dke dkg dkk dko dkr dks dod doe dog dok doo dor dos drd dre drg drk dro drr drs dsd dse dsg dsk dso dsr dss ed- edd ede edg edk edo edr eds eed eee eeg eek eeo eer ees egd ege egg ego egr egs ekd eke ekg eko ekr eks eo- eod eoe eog eok eoo eor eos erd ere erg erk ero err ers es- esd ese esg esk eso esr ess g-d gdd gde gdk gdo gdr gds ge- ged gee geg gek geo ger ges ggd ggg ggo ggr ggs gkd gko gks god goe gog gok goo gor gos grd gre grg grk gro grr grs gsd gse gsg gsk gso gsr gss kde kdg kdk kdo kdr kds ke- ked kee keg kek keo ker kes kgd kgo kgs kke kkk kkr kks kod koe kog kok koo kor kos krd krg krk kro krr krs ksd kse ksg ksk kso ksr kss odd ode odg odo odr ods oed oee oeg oeo oer oes ogd oge ogg ogo ogs okd oke okg okk oko okr oks oo- ood oog ook ooo oor oos or- ord ore org ork oro orr ors os- osd ose osg osk oso osr oss rdd rde rdg rdo rdr rds re- red ree reg rek reo rer res rgd rge rgg rgk rgo rgr rgs rke rkg rkk rko rks rod roe rog rok roo ror ros rrd rrg rrk rrr rrs rsd rse rsg rsk rso rsr rss sdd sde sdg sdk sdo sdr sds se- sed see seg sek seo ser ses sgd sge sgg sgk sgo sgr sgs sk- skd ske skg skk sko skr sks sod soe sog sok soo sor sos sr- srd sre srg srk sro srr srs ss- ssd sse ssg ssk sso ssr sss