a-a a-t aaa aad aae aat aax ad- ada add ade adt adx aea aed aee aet aex at- ata atd ate att atx ax- axa axe axt axx daa dad dae dat dax dda ddd dde ddt ddx de- dea ded dee det dex dta dtd dte dtt dtx dxd dxt dxx eaa ead eae eat eax ed- eda edd ede edt edx eea eed eee eet eex eta etd ete ett etx ex- exa exd exe ext exx t-x taa tad tae tat tax tda tdd tde tdt tdx te- tea ted tee tet tex tta ttd tte ttt ttx txe txt xaa xad xat xda xde xdt xed xee xet xex xtx xxx