ddd dde ddf ddi ddo dds ddt ddx de- ded dee def dei deo des det dex dfd dfe dff dfi dfo dfs dft dfx di- did die dif dii dio dis dit dix dod doe dof doi doo dos dot dox dsd dse dsf dsi dso dss dst dsx dtd dte dtf dti dto dts dtt dtx dxd dxi dxo dxs dxt dxx ed- edd ede edf edi edo eds edt edx eed eee eef eeo ees eet eex ef- efd efe eff efi efo efs eft efx eid eie eif eii eio eis eit eix eo- eod eoe eof eoi eoo eos eot es- esd ese esf esi eso ess est esx etd ete etf eti eto ets ett etx ex- exd exe exi exo exs ext exx fdd fde fdf fdi fdo fds fdt fdx fed fee fef fei feo fes fet fex ffd ffe fff ffi ffo ffs fft ffx fid fie fif fii fis fit fix foe fof foi foo fos fot fox fsd fse fsf fsi fso fss fst fsx ftd fte ftf fti fto fts ftt ftx fxe fxi fxs fxt fxx i-d i-f idd ide idf idi ido ids idt idx ie- ied iee ief iei ies iet iex ifd ife iff ifi ifo ifs ift ifx iid iie iif iii iio iis iit iix io- iod ioe iof ioi ioo ios iot is- isd ise isf isi iso iss ist itd ite itf iti ito its itt itx ixe ixi o-i odd ode odf odi odo ods odt oed oee oef oei oeo oes oet oex of- ofd ofe off ofi ofo ofs oft ofx oid oie oif oii oio ois oit oo- ood oof ooi ooo oos oot oox os- osd ose osf osi oso oss ost osx ot- otd ote otf oti oto ots ott ox- oxf oxi oxo oxt oxx sdd sde sdf sdi sdo sds sdt se- sed see sef sei seo ses set sex sfd sfe sff sfi sfo sfs sft sfx sid sie sif sii sio sis sit six sod soe sof soi soo sos sot sox ss- ssd sse ssf ssi sso sss sst ssx std ste stf sti sto sts stt stx sxi sxs sxt t-x tdd tde tdf tdi tdo tds tdt tdx te- ted tee tef tei teo tes tet tex tfd tfe tff tfi tfo tfs tft tfx tid tie tif tii tio tis tit tix to- tod toe tof toi too tos tot tox tsd tse tsf tsi tso tss tst tsx ttd tte ttf tti tto tts ttt ttx txe txf txi txs txt xde xdf xdi xds xdt xed xee xes xet xex xfe xfs xft xfx xie xii xio xis xit xix xod xof xoi xoo xos xot xox xsi xss xst xtf xti xts xtx xxi xxo xxx