-er ddd dde ddg ddo ddr dds ddt de- ded dee deg deo der des det dgd dge dgg dgr dgs dgt dod doe dog doo dor dos dot drd dre drg dro drr drs drt dsd dse dsg dso dsr dss dst dtd dte dtg dto dtr dts dtt ed- edd ede edg edo edr eds edt eed eee eeg eeo eer ees eet egd ege egg ego egr egs egt eo- eod eoe eog eoo eor eos eot erd ere erg ero err ers ert es- esd ese esg eso esr ess est etd ete etg eto etr ets ett g-d gdd gde gdo gdr gds gdt ge- ged gee geg geo ger ges get ggd ggg ggo ggr ggs ggt god goe gog goo gor gos got grd gre grg gro grr grs grt gsd gse gsg gso gsr gss gst gtd gte gtg gto gtr gts gtt odd ode odg odo odr ods odt oed oee oeg oeo oer oes oet ogd oge ogg ogo ogs ogt oo- ood oog ooo oor oos oot or- ord ore org oro orr ors ort os- osd ose osg oso osr oss ost ot- otd ote otg oto otr ots ott rdd rde rdg rdo rdr rds rdt re- red ree reg reo rer res ret rgd rge rgg rgo rgr rgs rgt rod roe rog roo ror ros rot rrd rrg rrr rrs rrt rsd rse rsg rso rsr rss rst rtd rte rtg rto rtr rts rtt sdd sde sdg sdo sdr sds sdt se- sed see seg seo ser ses set sgd sge sgg sgo sgr sgs sgt sod soe sog soo sor sos sot sr- srd sre srg sro srr srs srt ss- ssd sse ssg sso ssr sss sst std ste stg sto str sts stt tdd tde tdg tdo tdr tds tdt te- ted tee teg teo ter tes tet tge tgg tgo tgr tgs tgt to- tod toe tog too tor tos tot trd tre trg tro trr trs trt tsd tse tsg tso tsr tss tst ttd tte ttg tto ttr tts ttt