a-a a-b a-t aaa aab aag aao aat aax ab- aba abb abg abo abt abx ag- aga agb agg ago agt agx aoa aob aog aoo aot aox at- ata atb atg ato att atx ax- axa axo axt axx baa bab bag bao bat bax bba bbb bbg bbo bbt bbx bga bgb bgg bgo bgt bgx boa bob bog boo bot box bta btb btg bto btt btx bxb bxo bxx gaa gab gag gao gat gba gbg gbo gbt gbx gga ggb ggg ggo ggt goa gob gog goo got gox gta gtb gtg gto gtt gtx gxa gxt oaa oab oag oao oat oax ob- oba obb obg obo obt obx oga ogg ogo ogt ogx oo- ooa oob oog ooo oot oox ot- ota otb otg oto ott ox- oxa oxb oxo oxt oxx t-x taa tab tag tao tat tax tba tbb tbg tbo tbt tga tgb tgg tgo tgt to- toa tob tog too tot tox tta ttb ttg tto ttt ttx txt xaa xag xat xbx xoa xog xoo xot xox xtx xxo xxx