a-a a-b a-t a-z aaa aab aag aat aay aaz ab- aba abb abg abt aby abz ag- aga agb agg agt agy agz at- ata atb atg att atz ay- aya ayt ayz az- aza azb azg azt azy azz baa bab bag bat bay baz bba bbb bbg bbt bby bga bgb bgg bgt bgz bta btb btg btt bty btz by- bya byg byt byz bza bzz gaa gab gag gat gay gaz gba gbg gbt gby gbz gga ggb ggg ggt ggz gta gtb gtg gtt gty gy- gya gyb gza taa tab tag tat tay taz tba tbb tbg tbt tbz tga tgb tgg tgt tgy tgz tta ttb ttg ttt tty tya tyg tyt tza yaa yab yag yat yay yaz ybg yby ybz yga yta ytt yyb yyg yyt yyy yyz yzb yzy z-g zaa zab zag zat zay zaz zbb zbt zby zgb zgg zta zzt zzy zzz