a-a a-b a-c aaa aab aac aag aah aan ab- aba abb abc abg abh abn ac- aca acb acc acg ach acn ag- aga agb agc agg agh agn aha ahb ahc ahg ahh ahn an- ana anb anc ang anh ann baa bab bac bag bah ban bba bbb bbc bbg bbh bbn bca bcb bcc bcg bch bcn bga bgb bgc bgg bgh bgn bha bhb bhc bhg bhh bna bnb bnc bng bnn c-- caa cab cac cag cah can cba cbb cbc cbg cbh cbn cca ccb ccc ccg cch ccn cga cgb cgc cgg cgh cgn ch- cha chb chc chg chh chn cn- cna cnb cnc cng cnh cnn gaa gab gac gag gah gan gba gbc gbg gbh gbn gca gcb gcc gcg gch gcn gga ggb ggc ggg ggh ggn gha ghb ghc ghg ghh ghn gna gnb gnc gnn haa hab hac hag hah han hba hbb hbc hbg hbh hbn hca hcb hcc hcg hch hcn hga hgb hgc hgg hgh hgn hha hhb hhc hhg hhh hhn hna hnb hnc hng hnh hnn naa nab nac nag nah nan nba nbb nbc nbg nbn nca ncb ncc ncg nch ncn nga ngb ngc ngg ngh ngn nha nhb nhc nhg nhh nhn nna nnb nnc nng nnh nnn