a-a a-b a-t a-z aaa aab aag aat aaz ab- aba abb abg abt abz ag- aga agb agg agt agz at- ata atb atg att atz az- aza azb azg azt azz baa bab bag bat baz bba bbb bbg bbt bga bgb bgg bgt bgz bta btb btg btt btz bza bzz gaa gab gag gat gaz gba gbg gbt gbz gga ggb ggg ggt ggz gta gtb gtg gtt gza taa tab tag tat taz tba tbb tbg tbt tbz tga tgb tgg tgt tgz tta ttb ttg ttt tza z-g zaa zab zag zat zaz zbb zbt zgb zgg zta zzt zzz