-ey ddd dde ddf ddi ddx ddy de- ded dee def dei dex dey dfd dfe dff dfi dfx di- did die dif dii dix diy dxd dxi dxx dy- dyd dye dyy ed- edd ede edf edi edx edy eed eee eef eex eey ef- efd efe eff efi efx eid eie eif eii eix ex- exd exe exi exx exy eyd eye fdd fde fdf fdi fdx fed fee fef fei fex fey ffd ffe fff ffi ffx ffy fid fie fif fii fix fxe fxi fxx fy- fye fyi i-d i-f idd ide idf idi idx idy ie- ied iee ief iei iex iey ifd ife iff ifi ifx ify iid iie iif iii iix ixe ixi ixy iye iyy xde xdf xdi xed xee xex xfe xfx xie xii xix xxi xxx xxy xyy yde ydy yed yee yef yei yex yey yfd yfe yff yid yie yif yii yxe yxy yye yyf yyy