ddd dde ddf ddo ddt de- ded dee def deo det dfd dfe dff dfo dft dod doe dof doo dot dtd dte dtf dto dtt ed- edd ede edf edo edt eed eee eef eeo eet ef- efd efe eff efo eft eo- eod eoe eof eoo eot etd ete etf eto ett fdd fde fdf fdo fdt fed fee fef feo fet ffd ffe fff ffo fft foe fof foo fot ftd fte ftf fto ftt odd ode odf odo odt oed oee oef oeo oet of- ofd ofe off ofo oft oo- ood oof ooo oot ot- otd ote otf oto ott tdd tde tdf tdo tdt te- ted tee tef teo tet tfd tfe tff tfo tft to- tod toe tof too tot ttd tte ttf tto ttt