a-a a-b aaa aab aag aar aay ab- aba abb abg abr aby ag- aga agb agg agr agy ar- ara arb arg arr ary ay- aya ayr baa bab bag bar bay bba bbb bbg bbr bby bga bgb bgg bgr bra brb brg brr bry by- bya byg byr gaa gab gag gar gay gba gbg gbr gby gga ggb ggg ggr gra grb grg grr gry gy- gya gyb gyr ra- raa rab rag rar ray rba rbb rbg rbr rga rgb rgg rgr rra rrb rrg rrr ry- rya ryg ryr ryy yaa yab yag yar yay ybg ybr yby yga yra yrg yyb yyg yyy