a-a a-b aaa aab aag aah aak aan ab- aba abb abg abh abk abn ag- aga agb agg agh agk agn aha ahb ahg ahh ahk ahn aka akb akg akh akk akn an- ana anb ang anh ank ann baa bab bag bah bak ban bba bbb bbg bbh bbk bbn bga bgb bgg bgh bgk bgn bha bhb bhg bhh bhk bka bkb bkg bkk bkn bna bnb bng bnk bnn gaa gab gag gah gak gan gba gbg gbh gbk gbn gga ggb ggg ggh ggn gha ghb ghg ghh ghn gka gkb gkh gkn gna gnb gnn haa hab hag hah hak han hba hbb hbg hbh hbk hbn hga hgb hgg hgh hgk hgn hha hhb hhg hhh hhk hhn hka hkb hkg hkh hkk hkn hna hnb hng hnh hnk hnn ka- kaa kab kag kah kak kan kba kbb kbh kbk kbn kga kgb kgh kha khh khk khn kkb kkh kkk kkn kn- kna kng knk knn naa nab nag nah nak nan nba nbb nbg nbk nbn nga ngb ngg ngh ngk ngn nha nhb nhg nhh nhk nhn nka nkk nkn nna nnb nng nnh nnk nnn