a-a a-b a-z aaa aab aam aan aaz ab- aba abb abm abn abz ama amb amm amn amz an- ana anb anm ann anz az- aza azb azm azn azz baa bab bam ban baz bba bbb bbm bbn bma bmb bmm bmn bmz bna bnb bnn bnz bza bzn bzz maa mab mam man maz mba mbb mbm mma mmb mmm mmn mmz mna mnb mnm mnn mnz mza mzb mzm mzn naa nab nam nan naz nba nbb nbm nbn nma nmb nmm nmn nmz nna nnb nnm nnn nnz nzb nzz zaa zab zam zan zaz zbb zbm zma zmb zmm znn zzz