a-a a-b aaa aab aad aah aay ab- aba abb abd abh aby ad- ada adb add adh ady aha ahb ahd ahh ahy ay- aya ayd ayh baa bab bad bah bay bba bbb bbd bbh bby bda bdb bdd bdh bdy bha bhb bhd bhh by- bya byd byh daa dab dad dah day dba dbb dbd dbh dby dda ddb ddd ddh ddy dh- dha dhb dhd dhh dy- dya dyb dyd dyy haa hab had hah hay hba hbb hbd hbh hby hda hdb hdd hdh hdy hha hhb hhd hhh hhy hy- hya hyb hyd hyh hyy yaa yab yad yah yay yby yda ydy yha yyb yyy