a-a a-b a-q a-t aaa aab aad aao aaq aat ab- aba abb abd abo abq abt ad- ada adb add ado adq adt aoa aob aod aoo aot aqa aqo aqt at- ata atb atd ato att baa bab bad bao baq bat bba bbb bbd bbo bbq bbt bda bdb bdd bdo bdq bdt boa bob bod boo boq bot bqd bqt bta btb btd bto btq btt daa dab dad dao daq dat dba dbb dbd dbo dbq dbt dda ddb ddd ddo ddq ddt doa dob dod doo doq dot dqa dta dtb dtd dto dtt oaa oab oad oao oaq oat ob- oba obb obd obo obt oda odb odd odo odt oo- ooa oob ood ooo oot oqb oqo ot- ota otb otd oto ott qaa qad qat qba qbd qbq qda qdb qdt qoo qqq qta qtd qto qtq taa tab tad tao taq tat tba tbb tbd tbo tbt tda tdb tdd tdo tdt to- toa tob tod too toq tot tqo tta ttb ttd tto ttt