-er ddd dde ddi ddn ddr dds ddt de- ded dee dei den der des det di- did die dii din dir dis dit dnd dne dni dnn dnr dns dnt drd dre dri drn drr drs drt dsd dse dsi dsn dsr dss dst dtd dte dti dtn dtr dts dtt ed- edd ede edi edn edr eds edt eed eee een eer ees eet eid eie eii ein eir eis eit en- end ene eni enn enr ens ent erd ere eri ern err ers ert es- esd ese esi esn esr ess est etd ete eti etn etr ets ett i-d idd ide idi idn idr ids idt ie- ied iee iei ien ier ies iet iid iie iii iin iir iis iit in- ind ine ini inn inr ins int ir- ird ire iri irn irr irs irt is- isd ise isi isn isr iss ist itd ite iti itn its itt n-i ndd nde ndi ndn ndr nds ndt ne- ned nee nei nen ner nes net nid nie nii nin nir nis nit nne nni nnn nns nnt nrd nre nri nrn nrr nrs nrt nsd nse nsi nsn nsr nss nst ntd nte nti ntn ntr nts ntt rdd rde rdi rdn rdr rds rdt re- red ree rei ren rer res ret rid rie rii rin rir ris rit rnd rni rnn rnr rns rnt rrd rri rrn rrr rrs rrt rsd rse rsi rsn rsr rss rst rtd rte rti rtn rtr rts rtt sdd sde sdi sdn sdr sds sdt se- sed see sei sen ser ses set sid sie sii sin sir sis sit snd sne sni snn snr sns snt sr- srd sre sri srn srr srs srt ss- ssd sse ssi ssn ssr sss sst std ste sti stn str sts stt tdd tde tdi tdn tdr tds tdt te- ted tee tei ten ter tes tet tid tie tii tin tir tis tit tnd tne tni tnn tnr tns tnt trd tre tri trn trr trs trt tsd tse tsi tsn tsr tss tst ttd tte tti ttn ttr tts ttt