-er ddd dde ddn ddo ddr dds ddt de- ded dee den deo der des det dnd dne dnn dno dnr dns dnt dod doe don doo dor dos dot drd dre drn dro drr drs drt dsd dse dsn dso dsr dss dst dtd dte dtn dto dtr dts dtt ed- edd ede edn edo edr eds edt eed eee een eeo eer ees eet en- end ene enn eno enr ens ent eo- eod eoe eon eoo eor eos eot erd ere ern ero err ers ert es- esd ese esn eso esr ess est etd ete etn eto etr ets ett ndd nde ndn ndo ndr nds ndt ne- ned nee nen neo ner nes net nne nnn nno nns nnt no- nod noe non noo nor nos not nrd nre nrn nro nrr nrs nrt nsd nse nsn nso nsr nss nst ntd nte ntn nto ntr nts ntt odd ode odn odo odr ods odt oed oee oen oeo oer oes oet on- ond one onn ono onr ons ont oo- ood oon ooo oor oos oot or- ord ore orn oro orr ors ort os- osd ose osn oso osr oss ost ot- otd ote otn oto otr ots ott rdd rde rdn rdo rdr rds rdt re- red ree ren reo rer res ret rnd rnn rno rnr rns rnt rod roe ron roo ror ros rot rrd rrn rrr rrs rrt rsd rse rsn rso rsr rss rst rtd rte rtn rto rtr rts rtt sdd sde sdn sdo sdr sds sdt se- sed see sen seo ser ses set snd sne snn sno snr sns snt sod soe son soo sor sos sot sr- srd sre srn sro srr srs srt ss- ssd sse ssn sso ssr sss sst std ste stn sto str sts stt tdd tde tdn tdo tdr tds tdt te- ted tee ten teo ter tes tet tnd tne tnn tno tnr tns tnt to- tod toe ton too tor tos tot trd tre trn tro trr trs trt tsd tse tsn tso tsr tss tst ttd tte ttn tto ttr tts ttt