a-a a-b a-z aaa aab aad aah aaz ab- aba abb abd abh abz ad- ada adb add adh adz aha ahb ahd ahh ahz az- aza azb azd azz baa bab bad bah baz bba bbb bbd bbh bda bdb bdd bdh bdz bha bhb bhd bhh bza bzd bzh bzz daa dab dad dah daz dba dbb dbd dbh dbz dda ddb ddd ddh ddz dh- dha dhb dhd dhh dza dzb dzd haa hab had hah haz hba hbb hbd hbh hbz hda hdb hdd hdh hdz hha hhb hhd hhh hhz hzd zaa zab zad zah zaz zbb zha zzz