-er ddd dde ddf ddg ddo ddr dds de- ded dee def deg deo der des dfd dfe dff dfg dfo dfr dfs dgd dge dgf dgg dgr dgs dod doe dof dog doo dor dos drd dre drg dro drr drs dsd dse dsf dsg dso dsr dss ed- edd ede edf edg edo edr eds eed eee eef eeg eeo eer ees ef- efd efe eff efg efo efr efs egd ege egf egg ego egr egs eo- eod eoe eof eog eoo eor eos erd ere erf erg ero err ers es- esd ese esf esg eso esr ess fdd fde fdf fdg fdo fdr fds fed fee fef feg feo fer fes ffd ffe fff ffg ffo ffr ffs fgd fge fgf fgg fgr fgs foe fof fog foo for fos frd fre frf frg fro frr frs fsd fse fsf fsg fso fsr fss g-d gdd gde gdf gdo gdr gds ge- ged gee gef geg geo ger ges gfd gfe gff gfo gfr gfs ggd ggg ggo ggr ggs god goe gof gog goo gor gos grd gre grf grg gro grr grs gsd gse gsf gsg gso gsr gss odd ode odf odg odo odr ods oed oee oef oeg oeo oer oes of- ofd ofe off ofg ofo ofr ofs ogd oge ogf ogg ogo ogs oo- ood oof oog ooo oor oos or- ord ore orf org oro orr ors os- osd ose osf osg oso osr oss rdd rde rdf rdg rdo rdr rds re- red ree ref reg reo rer res rfd rfe rff rfg rfo rfr rfs rgd rge rgf rgg rgo rgr rgs rod roe rof rog roo ror ros rrd rrf rrg rrr rrs rsd rse rsf rsg rso rsr rss sdd sde sdf sdg sdo sdr sds se- sed see sef seg seo ser ses sfd sfe sff sfg sfo sfr sfs sgd sge sgf sgg sgo sgr sgs sod soe sof sog soo sor sos sr- srd sre srf srg sro srr srs ss- ssd sse ssf ssg sso ssr sss