a-a a-b aaa aab aag aan aar aay ab- aba abb abg abn abr aby ag- aga agb agg agn agr agy an- ana anb ang ann anr any ar- ara arb arg arn arr ary ay- aya ayn ayr baa bab bag ban bar bay bba bbb bbg bbn bbr bby bga bgb bgg bgn bgr bna bnb bng bnn bnr bra brb brg brn brr bry by- bya byg byn byr gaa gab gag gan gar gay gba gbg gbn gbr gby gga ggb ggg ggn ggr gna gnb gnn gnr gra grb grg grn grr gry gy- gya gyb gyn gyr naa nab nag nan nar nay nba nbb nbg nbn nbr nga ngb ngg ngn nna nnb nng nnn nra nrb nrg nrn nrr nry nya nyg nyn nyy ra- raa rab rag ran rar ray rba rbb rbg rbn rbr rga rgb rgg rgn rgr rna rnb rng rnn rnr rny rra rrb rrg rrn rrr ry- rya ryg ryn ryr ryy yaa yab yag yan yar yay ybg ybr yby yga yna yng ynn yny yra yrg yrn yyb yyg yyy