a-a a-b a-q a-t aaa aab aan aao aaq aat ab- aba abb abn abo abq abt an- ana anb ann ano anq ant aoa aob aon aoo aot aqa aqn aqo aqt at- ata atb atn ato att baa bab ban bao baq bat bba bbb bbn bbo bbq bbt bna bnb bnn bno bnt boa bob bon boo boq bot bqt bta btb btn bto btq btt naa nab nan nao nat nba nbb nbn nbo nbt nna nnb nnn nno nnt no- noa nob non noo not nqt nta ntb ntn nto ntq ntt oaa oab oan oao oaq oat ob- oba obb obn obo obt on- ona onb onn ono ont oo- ooa oob oon ooo oot oqb oqo ot- ota otb otn oto ott qaa qan qat qba qbq qnb qoo qqq qta qto qtq taa tab tan tao taq tat tba tbb tbn tbo tbt tna tnb tnn tno tnq tnt to- toa tob ton too toq tot tqo tta ttb ttn tto ttt