a-a a-c a-t aaa aac aad aae aaf aat ac- aca acc acd ace acf act ad- ada adc add ade adf adt aea aec aed aee aef aet af- afa afc afd afe aff aft at- ata atc atd ate atf att c-- caa cac cad cae caf cat cca ccc ccd cce ccf cct cda cdc cdd cde cdf cdt ce- cea cec ced cee cef cet cfa cfc cfd cfe cff cft cta ctc ctd cte ctf ctt daa dac dad dae daf dat dca dcc dcd dce dcf dct dda ddc ddd dde ddf ddt de- dea dec ded dee def det dfa dfc dfd dfe dff dft dta dtc dtd dte dtf dtt eaa eac ead eae eaf eat ec- eca ecc ecd ece ecf ect ed- eda edc edd ede edf edt eea eec eed eee eef eet ef- efa efc efd efe eff eft eta etc etd ete etf ett faa fac fad fae faf fat fca fcc fcd fce fcf fct fda fdc fdd fde fdf fdt fea fec fed fee fef fet ffa ffc ffd ffe fff fft fta ftc ftd fte ftf ftt taa tac tad tae taf tat tca tcc tcd tce tcf tct tda tdc tdd tde tdf tdt te- tea tec ted tee tef tet tfa tfc tfd tfe tff tft tta ttc ttd tte ttf ttt