-er ddd dde ddf ddg ddr dds ddt de- ded dee def deg der des det dfd dfe dff dfg dfr dfs dft dgd dge dgf dgg dgr dgs dgt drd dre drg drr drs drt dsd dse dsf dsg dsr dss dst dtd dte dtf dtg dtr dts dtt ed- edd ede edf edg edr eds edt eed eee eef eeg eer ees eet ef- efd efe eff efg efr efs eft egd ege egf egg egr egs egt erd ere erf erg err ers ert es- esd ese esf esg esr ess est etd ete etf etg etr ets ett fdd fde fdf fdg fdr fds fdt fed fee fef feg fer fes fet ffd ffe fff ffg ffr ffs fft fgd fge fgf fgg fgr fgs fgt frd fre frf frg frr frs frt fsd fse fsf fsg fsr fss fst ftd fte ftf ftg ftr fts ftt g-d gdd gde gdf gdr gds gdt ge- ged gee gef geg ger ges get gfd gfe gff gfr gfs gft ggd ggg ggr ggs ggt grd gre grf grg grr grs grt gsd gse gsf gsg gsr gss gst gtd gte gtf gtg gtr gts gtt rdd rde rdf rdg rdr rds rdt re- red ree ref reg rer res ret rfd rfe rff rfg rfr rfs rft rgd rge rgf rgg rgr rgs rgt rrd rrf rrg rrr rrs rrt rsd rse rsf rsg rsr rss rst rtd rte rtf rtg rtr rts rtt sdd sde sdf sdg sdr sds sdt se- sed see sef seg ser ses set sfd sfe sff sfg sfr sfs sft sgd sge sgf sgg sgr sgs sgt sr- srd sre srf srg srr srs srt ss- ssd sse ssf ssg ssr sss sst std ste stf stg str sts stt tdd tde tdf tdg tdr tds tdt te- ted tee tef teg ter tes tet tfd tfe tff tfg tfr tfs tft tge tgf tgg tgr tgs tgt trd tre trf trg trr trs trt tsd tse tsf tsg tsr tss tst ttd tte ttf ttg ttr tts ttt