-er ddd dde ddf ddi ddo ddr dds ddt de- ded dee def dei deo der des det dfd dfe dff dfi dfo dfr dfs dft di- did die dif dii dio dir dis dit dod doe dof doi doo dor dos dot drd dre dri dro drr drs drt dsd dse dsf dsi dso dsr dss dst dtd dte dtf dti dto dtr dts dtt ed- edd ede edf edi edo edr eds edt eed eee eef eeo eer ees eet ef- efd efe eff efi efo efr efs eft eid eie eif eii eio eir eis eit eo- eod eoe eof eoi eoo eor eos eot erd ere erf eri ero err ers ert es- esd ese esf esi eso esr ess est etd ete etf eti eto etr ets ett fdd fde fdf fdi fdo fdr fds fdt fed fee fef fei feo fer fes fet ffd ffe fff ffi ffo ffr ffs fft fid fie fif fii fir fis fit foe fof foi foo for fos fot frd fre frf fri fro frr frs frt fsd fse fsf fsi fso fsr fss fst ftd fte ftf fti fto ftr fts ftt i-d i-f idd ide idf idi ido idr ids idt ie- ied iee ief iei ier ies iet ifd ife iff ifi ifo ifr ifs ift iid iie iif iii iio iir iis iit io- iod ioe iof ioi ioo ior ios iot ir- ird ire irf iri iro irr irs irt is- isd ise isf isi iso isr iss ist itd ite itf iti ito its itt o-i odd ode odf odi odo odr ods odt oed oee oef oei oeo oer oes oet of- ofd ofe off ofi ofo ofr ofs oft oid oie oif oii oio oir ois oit oo- ood oof ooi ooo oor oos oot or- ord ore orf ori oro orr ors ort os- osd ose osf osi oso osr oss ost ot- otd ote otf oti oto otr ots ott rdd rde rdf rdi rdo rdr rds rdt re- red ree ref rei reo rer res ret rfd rfe rff rfi rfo rfr rfs rft rid rie rif rii rio rir ris rit rod roe rof roi roo ror ros rot rrd rrf rri rrr rrs rrt rsd rse rsf rsi rso rsr rss rst rtd rte rtf rti rto rtr rts rtt sdd sde sdf sdi sdo sdr sds sdt se- sed see sef sei seo ser ses set sfd sfe sff sfi sfo sfr sfs sft sid sie sif sii sio sir sis sit sod soe sof soi soo sor sos sot sr- srd sre srf sri sro srr srs srt ss- ssd sse ssf ssi sso ssr sss sst std ste stf sti sto str sts stt tdd tde tdf tdi tdo tdr tds tdt te- ted tee tef tei teo ter tes tet tfd tfe tff tfi tfo tfr tfs tft tid tie tif tii tio tir tis tit to- tod toe tof toi too tor tos tot trd tre trf tri tro trr trs trt tsd tse tsf tsi tso tsr tss tst ttd tte ttf tti tto ttr tts ttt