-er ddd dde ddi ddo ddr dds ddt ddx de- ded dee dei deo der des det dex di- did die dii dio dir dis dit dix dod doe doi doo dor dos dot dox drd dre dri dro drr drs drt drx dsd dse dsi dso dsr dss dst dsx dtd dte dti dto dtr dts dtt dtx dxd dxi dxo dxr dxs dxt dxx ed- edd ede edi edo edr eds edt edx eed eee eeo eer ees eet eex eid eie eii eio eir eis eit eix eo- eod eoe eoi eoo eor eos eot erd ere eri ero err ers ert es- esd ese esi eso esr ess est esx etd ete eti eto etr ets ett etx ex- exd exe exi exo exr exs ext exx i-d idd ide idi ido idr ids idt idx ie- ied iee iei ier ies iet iex iid iie iii iio iir iis iit iix io- iod ioe ioi ioo ior ios iot ir- ird ire iri iro irr irs irt irx is- isd ise isi iso isr iss ist itd ite iti ito its itt itx ixe ixi o-i odd ode odi odo odr ods odt oed oee oei oeo oer oes oet oex oid oie oii oio oir ois oit oo- ood ooi ooo oor oos oot oox or- ord ore ori oro orr ors ort orx os- osd ose osi oso osr oss ost osx ot- otd ote oti oto otr ots ott ox- oxi oxo oxt oxx rdd rde rdi rdo rdr rds rdt rdx re- red ree rei reo rer res ret rex rid rie rii rio rir ris rit rix rod roe roi roo ror ros rot rox rrd rri rrr rrs rrt rsd rse rsi rso rsr rss rst rsx rtd rte rti rto rtr rts rtt rtx rxr rxs sdd sde sdi sdo sdr sds sdt se- sed see sei seo ser ses set sex sid sie sii sio sir sis sit six sod soe soi soo sor sos sot sox sr- srd sre sri sro srr srs srt srx ss- ssd sse ssi sso ssr sss sst ssx std ste sti sto str sts stt stx sxi sxs sxt t-x tdd tde tdi tdo tdr tds tdt tdx te- ted tee tei teo ter tes tet tex tid tie tii tio tir tis tit tix to- tod toe toi too tor tos tot tox trd tre tri tro trr trs trt trx tsd tse tsi tso tsr tss tst tsx ttd tte tti tto ttr tts ttt ttx txe txi txs txt xde xdi xdr xds xdt xed xee xer xes xet xex xie xii xio xis xit xix xod xoi xoo xor xos xot xox xrd xrt xrx xsi xss xst xti xtr xts xtx xxi xxo xxx