a-a a-b aaa aab aah aak aan ab- aba abb abh abk abn aha ahb ahh ahk ahn aka akb akh akk akn an- ana anb anh ank ann baa bab bah bak ban bba bbb bbh bbk bbn bha bhb bhh bhk bka bkb bkk bkn bna bnb bnk bnn haa hab hah hak han hba hbb hbh hbk hbn hha hhb hhh hhk hhn hka hkb hkh hkk hkn hna hnb hnh hnk hnn ka- kaa kab kah kak kan kba kbb kbh kbk kbn kha khh khk khn kkb kkh kkk kkn kn- kna knk knn naa nab nah nak nan nba nbb nbk nbn nha nhb nhh nhk nhn nka nkk nkn nna nnb nnh nnk nnn