a-a a-b aaa aab aad aah aak aan ab- aba abb abd abh abk abn ad- ada adb add adh adk adn aha ahb ahd ahh ahk ahn aka akb akd akh akk akn an- ana anb and anh ank ann baa bab bad bah bak ban bba bbb bbd bbh bbk bbn bda bdb bdd bdh bdk bha bhb bhd bhh bhk bka bkb bkk bkn bna bnb bnd bnk bnn daa dab dad dah dak dan dba dbb dbd dbh dbk dbn dda ddb ddd ddh ddk ddn dh- dha dhb dhd dhh dhk dka dkb dkk dna dnb dnd dnh dnk dnn haa hab had hah hak han hba hbb hbd hbh hbk hbn hda hdb hdd hdh hdk hdn hha hhb hhd hhh hhk hhn hka hkb hkd hkh hkk hkn hna hnb hnd hnh hnk hnn ka- kaa kab kad kah kak kan kba kbb kbd kbh kbk kbn kda kdb kdh kdk kha khh khk khn kkb kkh kkk kkn kn- kna knd knk knn naa nab nad nah nak nan nba nbb nbd nbk nbn nda ndb ndd ndh ndk ndn nha nhb nhd nhh nhk nhn nka nkk nkn nna nnb nnh nnk nnn