a-a a-b a-i aaa aab aad aai aak aay ab- aba abb abd abi abk aby ad- ada adb add adi adk ady ai- aia aib aid aii aik aiy aka akb akd aki akk ay- aya ayd ayi ayk baa bab bad bai bak bay bba bbb bbd bbi bbk bby bda bdb bdd bdi bdk bdy bi- bia bib bid bii bik biy bka bkb bkk by- bya byd byi byk daa dab dad dai dak day dba dbb dbd dbi dbk dby dda ddb ddd ddi ddk ddy di- dia dib did dii dik diy dka dkb dki dkk dy- dya dyb dyd dyk dyy i-d ia- iaa iab iad iai iba ibb ibd ibi ibk iby ida idb idd idi idk idy iia iib iid iii ika ikb iki ikk iya iyy ka- kaa kab kad kai kak kay kba kbb kbd kbi kbk kda kdb kdk kdy kia kib kid kii kik kkb kki kkk kky kya kyd yaa yab yad yai yak yay ybi yby yda ydy yid yii yka yki ykk yyb yyy