a-a a-b a-c aaa aab aac aag aah aak aan ab- aba abb abc abg abh abk abn ac- aca acb acc acg ach ack acn ag- aga agb agc agg agh agk agn aha ahb ahc ahg ahh ahk ahn aka akb akc akg akh akk akn an- ana anb anc ang anh ank ann baa bab bac bag bah bak ban bba bbb bbc bbg bbh bbk bbn bca bcb bcc bcg bch bck bcn bga bgb bgc bgg bgh bgk bgn bha bhb bhc bhg bhh bhk bka bkb bkc bkg bkk bkn bna bnb bnc bng bnk bnn c-- caa cab cac cag cah cak can cba cbb cbc cbg cbh cbk cbn cca ccb ccc ccg cch cck ccn cga cgb cgc cgg cgh cgn ch- cha chb chc chg chh chk chn cka ckb ckc ckh cn- cna cnb cnc cng cnh cnn gaa gab gac gag gah gak gan gba gbc gbg gbh gbk gbn gca gcb gcc gcg gch gck gcn gga ggb ggc ggg ggh ggn gha ghb ghc ghg ghh ghn gka gkb gkh gkn gna gnb gnc gnn haa hab hac hag hah hak han hba hbb hbc hbg hbh hbk hbn hca hcb hcc hcg hch hck hcn hga hgb hgc hgg hgh hgk hgn hha hhb hhc hhg hhh hhk hhn hka hkb hkg hkh hkk hkn hna hnb hnc hng hnh hnk hnn ka- kaa kab kac kag kah kak kan kba kbb kbc kbh kbk kbn kca kcb kcc kcg kch kck kcn kga kgb kgc kgh kha khh khk khn kkb kkc kkh kkk kkn kn- kna knc kng knk knn naa nab nac nag nah nak nan nba nbb nbc nbg nbk nbn nca ncb ncc ncg nch nck ncn nga ngb ngc ngg ngh ngk ngn nha nhb nhc nhg nhh nhk nhn nka nkc nkk nkn nna nnb nnc nng nnh nnk nnn