a-a a-b a-t aaa aab aag aam aat ab- aba abb abg abm abt ag- aga agb agg agm agt ama amb amg amm amt at- ata atb atg atm att baa bab bag bam bat bba bbb bbg bbm bbt bga bgb bgg bgm bgt bma bmb bmg bmm bmt bta btb btg btm btt gaa gab gag gam gat gba gbg gbm gbt gga ggb ggg ggm ggt gma gmb gmg gmm gmt gta gtb gtg gtm gtt maa mab mag mam mat mba mbb mbg mbm mbt mga mgb mgm mgt mma mmb mmg mmm mmt mta mtb mtg mtm mtt taa tab tag tam tat tba tbb tbg tbm tbt tga tgb tgg tgm tgt tma tmb tmg tmm tmt tta ttb ttg ttm ttt