a-a a-b aaa aab aag aar aas aay ab- aba abb abg abr abs aby ag- aga agb agg agr ags agy ar- ara arb arg arr ars ary as- asa asb asg asr ass asy ay- aya ayr ays baa bab bag bar bas bay bba bbb bbg bbr bbs bby bga bgb bgg bgr bgs bra brb brg brr brs bry bsa bsb bsg bsr bss bsy by- bya byg byr bys gaa gab gag gar gas gay gba gbg gbr gbs gby gga ggb ggg ggr ggs gra grb grg grr grs gry gsa gsb gsg gsr gss gy- gya gyb gyr gys ra- raa rab rag rar ras ray rba rbb rbg rbr rbs rga rgb rgg rgr rgs rra rrb rrg rrr rrs rsa rsb rsg rsr rss ry- rya ryg ryr rys ryy saa sab sag sar sas say sba sbb sbg sbr sbs sby sga sgb sgg sgr sgs sr- sra srb srg srr srs sry ss- ssa ssb ssg ssr sss sy- sya syb syg syr sys yaa yab yag yar yas yay ybg ybr ybs yby yga yra yrg yrs ysa ysb ysg ysr yss ysy yyb yyg yys yyy