a-a a-b aaa aab aad aah aak ab- aba abb abd abh abk ad- ada adb add adh adk aha ahb ahd ahh ahk aka akb akd akh akk baa bab bad bah bak bba bbb bbd bbh bbk bda bdb bdd bdh bdk bha bhb bhd bhh bhk bka bkb bkk daa dab dad dah dak dba dbb dbd dbh dbk dda ddb ddd ddh ddk dh- dha dhb dhd dhh dhk dka dkb dkk haa hab had hah hak hba hbb hbd hbh hbk hda hdb hdd hdh hdk hha hhb hhd hhh hhk hka hkb hkd hkh hkk ka- kaa kab kad kah kak kba kbb kbd kbh kbk kda kdb kdh kdk kha khh khk kkb kkh kkk