ddd dde ddo ddt ddx de- ded dee deo det dex dod doe doo dot dox dtd dte dto dtt dtx dxd dxo dxt dxx ed- edd ede edo edt edx eed eee eeo eet eex eo- eod eoe eoo eot etd ete eto ett etx ex- exd exe exo ext exx odd ode odo odt oed oee oeo oet oex oo- ood ooo oot oox ot- otd ote oto ott ox- oxo oxt oxx t-x tdd tde tdo tdt tdx te- ted tee teo tet tex to- tod toe too tot tox ttd tte tto ttt ttx txe txt xde xdt xed xee xet xex xod xoo xot xox xtx xxo xxx