a-a a-b aaa aab aad aag aay ab- aba abb abd abg aby ad- ada adb add adg ady ag- aga agb agd agg agy ay- aya ayd baa bab bad bag bay bba bbb bbd bbg bby bda bdb bdd bdg bdy bga bgb bgd bgg by- bya byd byg daa dab dad dag day dba dbb dbd dbg dby dda ddb ddd ddg ddy dga dgd dgg dy- dya dyb dyd dyy g-d gaa gab gad gag gay gba gbd gbg gby gda gdb gdd gga ggb ggd ggg gy- gya gyb gyd yaa yab yad yag yay ybg yby yda ydg ydy yga yyb yyg yyy