ddd ddf ddi ddo ddt ddx dfd dff dfi dfo dft dfx di- did dif dii dio dit dix dod dof doi doo dot dox dtd dtf dti dto dtt dtx dxd dxi dxo dxt dxx fdd fdf fdi fdo fdt fdx ffd fff ffi ffo fft ffx fid fif fii fit fix fof foi foo fot fox ftd ftf fti fto ftt ftx fxi fxt fxx i-d i-f idd idf idi ido idt idx ifd iff ifi ifo ift ifx iid iif iii iio iit iix io- iod iof ioi ioo iot itd itf iti ito itt itx ixi o-i odd odf odi odo odt of- ofd off ofi ofo oft ofx oid oif oii oio oit oo- ood oof ooi ooo oot oox ot- otd otf oti oto ott ox- oxf oxi oxo oxt oxx t-x tdd tdf tdi tdo tdt tdx tfd tff tfi tfo tft tfx tid tif tii tio tit tix to- tod tof toi too tot tox ttd ttf tti tto ttt ttx txf txi txt xdf xdi xdt xft xfx xii xio xit xix xod xof xoi xoo xot xox xtf xti xtx xxi xxo xxx