a-a a-c a-t aaa aac aad aae aat aax ac- aca acc acd ace act acx ad- ada adc add ade adt adx aea aec aed aee aet aex at- ata atc atd ate att atx ax- axa axe axt axx c-- caa cac cad cae cat cax cca ccc ccd cce cct ccx cda cdc cdd cde cdt cdx ce- cea cec ced cee cet cex cta ctc ctd cte ctt ctx cxc cxt cxx daa dac dad dae dat dax dca dcc dcd dce dct dcx dda ddc ddd dde ddt ddx de- dea dec ded dee det dex dta dtc dtd dte dtt dtx dxc dxd dxt dxx eaa eac ead eae eat eax ec- eca ecc ecd ece ect ecx ed- eda edc edd ede edt edx eea eec eed eee eet eex eta etc etd ete ett etx ex- exa exc exd exe ext exx t-x taa tac tad tae tat tax tca tcc tcd tce tct tcx tda tdc tdd tde tdt tdx te- tea tec ted tee tet tex tta ttc ttd tte ttt ttx txe txt xaa xac xad xat xcd xcx xda xdc xde xdt xed xee xet xex xtc xtx xxx