a-a a-b a-q a-t aaa aab aad aan aaq aat ab- aba abb abd abn abq abt ad- ada adb add adn adq adt an- ana anb and ann anq ant aqa aqn aqt at- ata atb atd atn att baa bab bad ban baq bat bba bbb bbd bbn bbq bbt bda bdb bdd bdq bdt bna bnb bnd bnn bnt bqd bqt bta btb btd btn btq btt daa dab dad dan daq dat dba dbb dbd dbn dbq dbt dda ddb ddd ddn ddq ddt dna dnb dnd dnn dnq dnt dqa dqn dta dtb dtd dtn dtt naa nab nad nan nat nba nbb nbd nbn nbt nda ndb ndd ndn ndt nna nnb nnn nnt nqt nta ntb ntd ntn ntq ntt qaa qad qan qat qba qbd qbq qda qdb qdt qnb qnd qqq qta qtd qtq taa tab tad tan taq tat tba tbb tbd tbn tbt tda tdb tdd tdn tdt tna tnb tnd tnn tnq tnt tta ttb ttd ttn ttt