a-a a-b aaa aab aad aah aao aay ab- aba abb abd abh abo aby ad- ada adb add adh ado ady aha ahb ahd ahh aho ahy aoa aob aod aoh aoo ay- aya ayd ayh ayo baa bab bad bah bao bay bba bbb bbd bbh bbo bby bda bdb bdd bdh bdo bdy bha bhb bhd bhh bho boa bob bod boh boo boy by- bya byd byh byo daa dab dad dah dao day dba dbb dbd dbh dbo dby dda ddb ddd ddh ddo ddy dh- dha dhb dhd dhh dho doa dob dod doh doo doy dy- dya dyb dyd dyo dyy haa hab had hah hao hay hba hbb hbd hbh hbo hby hda hdb hdd hdh hdo hdy hha hhb hhd hhh hho hhy hoa hob hod hoh hoo hoy hy- hya hyb hyd hyh hyo hyy oaa oab oad oah oao ob- oba obb obd obh obo oby oda odb odd odh odo oha ohd ohh oho oo- ooa oob ood ooh ooo oya oyd oyo yaa yab yad yah yao yay yby yda ydo ydy yha yob yod yoo yoy yyb yyy