a-a a-b a-q a-t a-z aaa aab aan aaq aat aaz ab- aba abb abn abq abt abz an- ana anb ann anq ant anz aqa aqn aqt at- ata atb atn att atz az- aza azb azn azq azt azz baa bab ban baq bat baz bba bbb bbn bbq bbt bna bnb bnn bnt bnz bqt bta btb btn btq btt btz bza bzn bzz naa nab nan nat naz nba nbb nbn nbt nna nnb nnn nnt nnz nqt nta ntb ntn ntq ntt ntz nzb nzz qaa qan qat qaz qba qbq qnb qqq qta qtq qtz taa tab tan taq tat taz tba tbb tbn tbt tbz tna tnb tnn tnq tnt tnz tta ttb ttn ttt tza zaa zab zan zaq zat zaz zbb zbt znn zta zzt zzz