-er ddd dde ddf ddi ddr dds ddt de- ded dee def dei der des det dfd dfe dff dfi dfr dfs dft di- did die dif dii dir dis dit drd dre dri drr drs drt dsd dse dsf dsi dsr dss dst dtd dte dtf dti dtr dts dtt ed- edd ede edf edi edr eds edt eed eee eef eer ees eet ef- efd efe eff efi efr efs eft eid eie eif eii eir eis eit erd ere erf eri err ers ert es- esd ese esf esi esr ess est etd ete etf eti etr ets ett fdd fde fdf fdi fdr fds fdt fed fee fef fei fer fes fet ffd ffe fff ffi ffr ffs fft fid fie fif fii fir fis fit frd fre frf fri frr frs frt fsd fse fsf fsi fsr fss fst ftd fte ftf fti ftr fts ftt i-d i-f idd ide idf idi idr ids idt ie- ied iee ief iei ier ies iet ifd ife iff ifi ifr ifs ift iid iie iif iii iir iis iit ir- ird ire irf iri irr irs irt is- isd ise isf isi isr iss ist itd ite itf iti its itt rdd rde rdf rdi rdr rds rdt re- red ree ref rei rer res ret rfd rfe rff rfi rfr rfs rft rid rie rif rii rir ris rit rrd rrf rri rrr rrs rrt rsd rse rsf rsi rsr rss rst rtd rte rtf rti rtr rts rtt sdd sde sdf sdi sdr sds sdt se- sed see sef sei ser ses set sfd sfe sff sfi sfr sfs sft sid sie sif sii sir sis sit sr- srd sre srf sri srr srs srt ss- ssd sse ssf ssi ssr sss sst std ste stf sti str sts stt tdd tde tdf tdi tdr tds tdt te- ted tee tef tei ter tes tet tfd tfe tff tfi tfr tfs tft tid tie tif tii tir tis tit trd tre trf tri trr trs trt tsd tse tsf tsi tsr tss tst ttd tte ttf tti ttr tts ttt