a-a a-b a-i aaa aab aad aai aay ab- aba abb abd abi aby ad- ada adb add adi ady ai- aia aib aid aii aiy ay- aya ayd ayi baa bab bad bai bay bba bbb bbd bbi bby bda bdb bdd bdi bdy bi- bia bib bid bii biy by- bya byd byi daa dab dad dai day dba dbb dbd dbi dby dda ddb ddd ddi ddy di- dia dib did dii diy dy- dya dyb dyd dyy i-d ia- iaa iab iad iai iba ibb ibd ibi iby ida idb idd idi idy iia iib iid iii iya iyy yaa yab yad yai yay ybi yby yda ydy yid yii yyb yyy