a-a a-b aaa aab aag aah aam ab- aba abb abg abh abm ag- aga agb agg agh agm aha ahb ahg ahh ahm ama amb amg amh amm baa bab bag bah bam bba bbb bbg bbh bbm bga bgb bgg bgh bgm bha bhb bhg bhh bhm bma bmb bmg bmh bmm gaa gab gag gah gam gba gbg gbh gbm gga ggb ggg ggh ggm gha ghb ghg ghh gma gmb gmg gmh gmm haa hab hag hah ham hba hbb hbg hbh hbm hga hgb hgg hgh hgm hha hhb hhg hhh hhm hma hmb hmg hmh hmm maa mab mag mah mam mba mbb mbg mbh mbm mga mgb mgh mgm mha mhg mhh mhm mma mmb mmg mmh mmm