-er ddd dde ddn ddp ddr dds ddt de- ded dee den dep der des det dnd dne dnn dnp dnr dns dnt dpd dpe dpn dpp dpr dps dpt drd dre drn drp drr drs drt dsd dse dsn dsp dsr dss dst dtd dte dtn dtp dtr dts dtt ed- edd ede edn edp edr eds edt eed eee een eep eer ees eet en- end ene enn enp enr ens ent ep- epd epe epn epp epr eps ept erd ere ern erp err ers ert es- esd ese esn esp esr ess est etd ete etn etp etr ets ett ndd nde ndn ndp ndr nds ndt ne- ned nee nen nep ner nes net nne nnn nnp nns nnt npd npe npn npp npr nps npt nrd nre nrn nrp nrr nrs nrt nsd nse nsn nsp nsr nss nst ntd nte ntn ntp ntr nts ntt p-p pdd pde pdn pdp pdr pds pdt ped pee pen pep per pes pet pn- pnd pne pnn pnp pnr pns pnt ppd ppe ppn ppp ppr pps ppt prd pre prn prp prr prs prt ps- psd pse psn psp psr pss pst pt- ptd pte ptn ptp ptr pts ptt rdd rde rdn rdp rdr rds rdt re- red ree ren rep rer res ret rnd rnn rnp rnr rns rnt rpd rpe rpn rpp rpr rps rpt rrd rrn rrp rrr rrs rrt rsd rse rsn rsp rsr rss rst rtd rte rtn rtp rtr rts rtt sdd sde sdn sdp sdr sds sdt se- sed see sen sep ser ses set snd sne snn snp snr sns snt spd spe spn spp spr sps spt sr- srd sre srn srp srr srs srt ss- ssd sse ssn ssp ssr sss sst std ste stn stp str sts stt tdd tde tdn tdp tdr tds tdt te- ted tee ten tep ter tes tet tnd tne tnn tnp tnr tns tnt tpd tpe tpn tpp tpr tps tpt trd tre trn trp trr trs trt tsd tse tsn tsp tsr tss tst ttd tte ttn ttp ttr tts ttt