ddd dde ddf ddi ddl ddx de- ded dee def dei del dex dfd dfe dff dfi dfl dfx di- did die dif dii dil dix dl- dld dle dlf dli dll dlx dxd dxi dxl dxx ed- edd ede edf edi edl edx eed eee eef eel eex ef- efd efe eff efi efl efx eid eie eif eii eil eix eld ele elf eli ell elx ex- exd exe exi exl exx fdd fde fdf fdi fdl fdx fed fee fef fei fel fex ffd ffe fff ffi ffl ffx fid fie fif fii fil fix fld fle flf fli fll flx fxe fxi fxx i-d i-f idd ide idf idi idl idx ie- ied iee ief iei iel iex ifd ife iff ifi ifl ifx iid iie iif iii iil iix il- ild ile ilf ili ill ilx ixe ixi ixl ldd lde ldf ldi ldl led lee lef lei lel lex lfd lfe lff lfi lfl lfx lid lie lif lii lil lix lld lle llf lli lll lxd lxi lxx xde xdf xdi xed xee xel xex xfe xfl xfx xie xii xix xld xlf xli xxi xxl xxx