a-a a-b a-z aaa aab aag aan aaz ab- aba abb abg abn abz ag- aga agb agg agn agz an- ana anb ang ann anz az- aza azb azg azn azz baa bab bag ban baz bba bbb bbg bbn bga bgb bgg bgn bgz bna bnb bng bnn bnz bza bzn bzz gaa gab gag gan gaz gba gbg gbn gbz gga ggb ggg ggn ggz gna gnb gnn gza naa nab nag nan naz nba nbb nbg nbn nga ngb ngg ngn nna nnb nng nnn nnz nzb nzg nzz z-g zaa zab zag zan zaz zbb zgb zgg znn zzz