a-a a-i a-t aaa aad aae aaf aai aat aax ad- ada add ade adf adi adt adx aea aed aee aef aei aet aex af- afa afd afe aff afi aft afx ai- aia aid aie aif aii ait aix at- ata atd ate atf ati att atx ax- axa axe axi axt axx daa dad dae daf dai dat dax dda ddd dde ddf ddi ddt ddx de- dea ded dee def dei det dex dfa dfd dfe dff dfi dft dfx di- dia did die dif dii dit dix dta dtd dte dtf dti dtt dtx dxd dxi dxt dxx eaa ead eae eaf eai eat eax ed- eda edd ede edf edi edt edx eea eed eee eef eet eex ef- efa efd efe eff efi eft efx eia eid eie eif eii eit eix eta etd ete etf eti ett etx ex- exa exd exe exi ext exx faa fad fae faf fai fat fax fda fdd fde fdf fdi fdt fdx fea fed fee fef fei fet fex ffa ffd ffe fff ffi fft ffx fia fid fie fif fii fit fix fta ftd fte ftf fti ftt ftx fxe fxi fxt fxx i-d i-f ia- iaa iad iae iaf iai iat ida idd ide idf idi idt idx ie- iea ied iee ief iei iet iex ifa ifd ife iff ifi ift ifx iia iid iie iif iii iit iix ita itd ite itf iti itt itx ixe ixi t-x taa tad tae taf tai tat tax tda tdd tde tdf tdi tdt tdx te- tea ted tee tef tei tet tex tfa tfd tfe tff tfi tft tfx tia tid tie tif tii tit tix tta ttd tte ttf tti ttt ttx txe txf txi txt xaa xad xaf xat xda xde xdf xdi xdt xed xee xet xex xfa xfe xft xfx xia xie xii xit xix xtf xti xtx xxi xxx