a-a a-b a-t a-z aaa aab aag aan aat aaz ab- aba abb abg abn abt abz ag- aga agb agg agn agt agz an- ana anb ang ann ant anz at- ata atb atg atn att atz az- aza azb azg azn azt azz baa bab bag ban bat baz bba bbb bbg bbn bbt bga bgb bgg bgn bgt bgz bna bnb bng bnn bnt bnz bta btb btg btn btt btz bza bzn bzz gaa gab gag gan gat gaz gba gbg gbn gbt gbz gga ggb ggg ggn ggt ggz gna gnb gnn gnt gta gtb gtg gtn gtt gza naa nab nag nan nat naz nba nbb nbg nbn nbt nga ngb ngg ngn ngt nna nnb nng nnn nnt nnz nta ntb ntg ntn ntt ntz nzb nzg nzz taa tab tag tan tat taz tba tbb tbg tbn tbt tbz tga tgb tgg tgn tgt tgz tna tnb tng tnn tnt tnz tta ttb ttg ttn ttt tza z-g zaa zab zag zan zat zaz zbb zbt zgb zgg znn zta zzt zzz