-ey a-a a-b aaa aab aad aae aay ab- aba abb abd abe aby ad- ada adb add ade ady aea aeb aed aee aey ay- aya ayd aye baa bab bad bae bay bba bbb bbd bbe bby bda bdb bdd bde bdy be- bea beb bed bee bey by- bya byd bye daa dab dad dae day dba dbb dbd dbe dby dda ddb ddd dde ddy de- dea deb ded dee dey dy- dya dyb dyd dye dyy eaa eab ead eae eba ebb ebd ebe eby ed- eda edb edd ede edy eea eeb eed eee eey eya eyd eye yaa yab yad yae yay ybe yby yda yde ydy yea yeb yed yee yey yyb yye yyy