ddd dde ddo dds ddt ddx de- ded dee deo des det dex dod doe doo dos dot dox dsd dse dso dss dst dsx dtd dte dto dts dtt dtx dxd dxo dxs dxt dxx ed- edd ede edo eds edt edx eed eee eeo ees eet eex eo- eod eoe eoo eos eot es- esd ese eso ess est esx etd ete eto ets ett etx ex- exd exe exo exs ext exx odd ode odo ods odt oed oee oeo oes oet oex oo- ood ooo oos oot oox os- osd ose oso oss ost osx ot- otd ote oto ots ott ox- oxo oxt oxx sdd sde sdo sds sdt se- sed see seo ses set sex sod soe soo sos sot sox ss- ssd sse sso sss sst ssx std ste sto sts stt stx sxs sxt t-x tdd tde tdo tds tdt tdx te- ted tee teo tes tet tex to- tod toe too tos tot tox tsd tse tso tss tst tsx ttd tte tto tts ttt ttx txe txs txt xde xds xdt xed xee xes xet xex xod xoo xos xot xox xss xst xts xtx xxo xxx