a-a a-b a-z aaa aab aad aag aaz ab- aba abb abd abg abz ad- ada adb add adg adz ag- aga agb agd agg agz az- aza azb azd azg azz baa bab bad bag baz bba bbb bbd bbg bda bdb bdd bdg bdz bga bgb bgd bgg bgz bza bzd bzz daa dab dad dag daz dba dbb dbd dbg dbz dda ddb ddd ddg ddz dga dgd dgg dgz dza dzb dzd g-d gaa gab gad gag gaz gba gbd gbg gbz gda gdb gdd gga ggb ggd ggg ggz gza z-g zaa zab zad zag zaz zbb zgb zgg zzz