a-a a-b a-q aaa aab aad aae aan aaq ab- aba abb abd abe abn abq ad- ada adb add ade adn adq aea aeb aed aee aen aeq an- ana anb and ane ann anq aqa aqn baa bab bad bae ban baq bba bbb bbd bbe bbn bbq bda bdb bdd bde bdq be- bea beb bed bee ben beq bna bnb bnd bne bnn bqd bqe daa dab dad dae dan daq dba dbb dbd dbe dbn dbq dda ddb ddd dde ddn ddq de- dea deb ded dee den deq dna dnb dnd dne dnn dnq dqa dqe dqn eaa eab ead eae ean eba ebb ebd ebe ebn ebq ed- eda edb edd ede edn eea eeb eed eee een en- ena enb end ene enn eqa eqe eqn eqq naa nab nad nae nan nba nbb nbd nbe nbn nda ndb ndd nde ndn ne- nea neb ned nee nen nna nnb nne nnn qaa qad qan qba qbd qbe qbq qda qdb qed qee qen qnb qnd qne qqq