-ey a-a a-b aaa aab aad aae aak aay ab- aba abb abd abe abk aby ad- ada adb add ade adk ady aea aeb aed aee aek aey aka akb akd ake akk ay- aya ayd aye ayk baa bab bad bae bak bay bba bbb bbd bbe bbk bby bda bdb bdd bde bdk bdy be- bea beb bed bee bek bey bka bkb bke bkk by- bya byd bye byk daa dab dad dae dak day dba dbb dbd dbe dbk dby dda ddb ddd dde ddk ddy de- dea deb ded dee dek dey dka dkb dke dkk dy- dya dyb dyd dye dyk dyy eaa eab ead eae eak eba ebb ebd ebe ebk eby ed- eda edb edd ede edk edy eea eeb eed eee eek eey eka ekb ekd eke eky eya eyd eye ka- kaa kab kad kae kak kay kba kbb kbd kbe kbk kda kdb kde kdk kdy ke- kea keb ked kee kek key kkb kke kkk kky kya kyd kye yaa yab yad yae yak yay ybe yby yda yde ydy yea yeb yed yee yek yey yka ykk yyb yye yyy