a-a a-b a-t aaa aab aag aar aat aay ab- aba abb abg abr abt aby ag- aga agb agg agr agt agy ar- ara arb arg arr art ary at- ata atb atg atr att ay- aya ayr ayt baa bab bag bar bat bay bba bbb bbg bbr bbt bby bga bgb bgg bgr bgt bra brb brg brr brt bry bta btb btg btr btt bty by- bya byg byr byt gaa gab gag gar gat gay gba gbg gbr gbt gby gga ggb ggg ggr ggt gra grb grg grr grt gry gta gtb gtg gtr gtt gty gy- gya gyb gyr ra- raa rab rag rar rat ray rba rbb rbg rbr rbt rga rgb rgg rgr rgt rra rrb rrg rrr rrt rta rtb rtg rtr rtt rty ry- rya ryg ryr ryy taa tab tag tar tat tay tba tbb tbg tbr tbt tga tgb tgg tgr tgt tgy tra trb trg trr trt try tta ttb ttg ttr ttt tty tya tyg tyr tyt yaa yab yag yar yat yay ybg ybr yby yga yra yrg yrt yta ytr ytt yyb yyg yyt yyy