-ey a-a a-b a-t aaa aab aad aae aat aay ab- aba abb abd abe abt aby ad- ada adb add ade adt ady aea aeb aed aee aet aey at- ata atb atd ate att ay- aya ayd aye ayt baa bab bad bae bat bay bba bbb bbd bbe bbt bby bda bdb bdd bde bdt bdy be- bea beb bed bee bet bey bta btb btd bte btt bty by- bya byd bye byt daa dab dad dae dat day dba dbb dbd dbe dbt dby dda ddb ddd dde ddt ddy de- dea deb ded dee det dey dta dtb dtd dte dtt dty dy- dya dyb dyd dye dyy eaa eab ead eae eat eba ebb ebd ebe ebt eby ed- eda edb edd ede edt edy eea eeb eed eee eet eey eta etb etd ete ett ety eya eyd eye eyt taa tab tad tae tat tay tba tbb tbd tbe tbt tda tdb tdd tde tdt tdy te- tea teb ted tee tet tey tta ttb ttd tte ttt tty tya tyd tye tyt yaa yab yad yae yat yay ybe yby yda yde ydt ydy yea yeb yed yee yet yey yta ytd yte ytt yyb yye yyt yyy