a-a a-b aaa aab aad aae aah aak aan ab- aba abb abd abe abh abk abn ad- ada adb add ade adh adk adn aea aeb aed aee aeh aek aen aha ahb ahd ahe ahh ahk ahn aka akb akd ake akh akk akn an- ana anb and ane anh ank ann baa bab bad bae bah bak ban bba bbb bbd bbe bbh bbk bbn bda bdb bdd bde bdh bdk be- bea beb bed bee beh bek ben bha bhb bhd bhe bhh bhk bka bkb bke bkk bkn bna bnb bnd bne bnk bnn daa dab dad dae dah dak dan dba dbb dbd dbe dbh dbk dbn dda ddb ddd dde ddh ddk ddn de- dea deb ded dee deh dek den dh- dha dhb dhd dhe dhh dhk dka dkb dke dkk dna dnb dnd dne dnh dnk dnn eaa eab ead eae eah eak ean eba ebb ebd ebe ebh ebk ebn ed- eda edb edd ede edh edk edn eea eeb eed eee eek een eha ehb ehd ehe ehh ehn eka ekb ekd eke ekh en- ena enb end ene enh enk enn haa hab had hae hah hak han hba hbb hbd hbe hbh hbk hbn hda hdb hdd hde hdh hdk hdn he- hea heb hed hee heh hek hen hha hhb hhd hhe hhh hhk hhn hka hkb hkd hkh hkk hkn hna hnb hnd hne hnh hnk hnn ka- kaa kab kad kae kah kak kan kba kbb kbd kbe kbh kbk kbn kda kdb kde kdh kdk ke- kea keb ked kee keh kek ken kha khe khh khk khn kkb kke kkh kkk kkn kn- kna knd kne knk knn naa nab nad nae nah nak nan nba nbb nbd nbe nbk nbn nda ndb ndd nde ndh ndk ndn ne- nea neb ned nee neh nek nen nha nhb nhd nhe nhh nhk nhn nka nke nkk nkn nna nnb nne nnh nnk nnn