a-a a-b aaa aab aad aae aah ab- aba abb abd abe abh ad- ada adb add ade adh aea aeb aed aee aeh aha ahb ahd ahe ahh baa bab bad bae bah bba bbb bbd bbe bbh bda bdb bdd bde bdh be- bea beb bed bee beh bha bhb bhd bhe bhh daa dab dad dae dah dba dbb dbd dbe dbh dda ddb ddd dde ddh de- dea deb ded dee deh dh- dha dhb dhd dhe dhh eaa eab ead eae eah eba ebb ebd ebe ebh ed- eda edb edd ede edh eea eeb eed eee eha ehb ehd ehe ehh haa hab had hae hah hba hbb hbd hbe hbh hda hdb hdd hde hdh he- hea heb hed hee heh hha hhb hhd hhe hhh