a-a a-b a-z aaa aab aag aar aay aaz ab- aba abb abg abr aby abz ag- aga agb agg agr agy agz ar- ara arb arg arr ary arz ay- aya ayr ayz az- aza azb azg azy azz baa bab bag bar bay baz bba bbb bbg bbr bby bga bgb bgg bgr bgz bra brb brg brr bry brz by- bya byg byr byz bza bzr bzz gaa gab gag gar gay gaz gba gbg gbr gby gbz gga ggb ggg ggr ggz gra grb grg grr gry gy- gya gyb gyr gza gzr ra- raa rab rag rar ray raz rba rbb rbg rbr rga rgb rgg rgr rra rrb rrg rrr ry- rya ryg ryr ryy ryz rza rzb rzy yaa yab yag yar yay yaz ybg ybr yby ybz yga yra yrg yyb yyg yyy yyz yzb yzr yzy z-g zaa zab zag zar zay zaz zbb zbr zby zgb zgg zzr zzy zzz