-er ddd dde ddi ddo ddr dds ddt de- ded dee dei deo der des det di- did die dii dio dir dis dit dod doe doi doo dor dos dot drd dre dri dro drr drs drt dsd dse dsi dso dsr dss dst dtd dte dti dto dtr dts dtt ed- edd ede edi edo edr eds edt eed eee eeo eer ees eet eid eie eii eio eir eis eit eo- eod eoe eoi eoo eor eos eot erd ere eri ero err ers ert es- esd ese esi eso esr ess est etd ete eti eto etr ets ett i-d idd ide idi ido idr ids idt ie- ied iee iei ier ies iet iid iie iii iio iir iis iit io- iod ioe ioi ioo ior ios iot ir- ird ire iri iro irr irs irt is- isd ise isi iso isr iss ist itd ite iti ito its itt o-i odd ode odi odo odr ods odt oed oee oei oeo oer oes oet oid oie oii oio oir ois oit oo- ood ooi ooo oor oos oot or- ord ore ori oro orr ors ort os- osd ose osi oso osr oss ost ot- otd ote oti oto otr ots ott rdd rde rdi rdo rdr rds rdt re- red ree rei reo rer res ret rid rie rii rio rir ris rit rod roe roi roo ror ros rot rrd rri rrr rrs rrt rsd rse rsi rso rsr rss rst rtd rte rti rto rtr rts rtt sdd sde sdi sdo sdr sds sdt se- sed see sei seo ser ses set sid sie sii sio sir sis sit sod soe soi soo sor sos sot sr- srd sre sri sro srr srs srt ss- ssd sse ssi sso ssr sss sst std ste sti sto str sts stt tdd tde tdi tdo tdr tds tdt te- ted tee tei teo ter tes tet tid tie tii tio tir tis tit to- tod toe toi too tor tos tot trd tre tri tro trr trs trt tsd tse tsi tso tsr tss tst ttd tte tti tto ttr tts ttt