a-a a-b a-c a-t aaa aab aac aag aao aat ab- aba abb abc abg abo abt ac- aca acb acc acg aco act ag- aga agb agc agg ago agt aoa aob aoc aog aoo aot at- ata atb atc atg ato att baa bab bac bag bao bat bba bbb bbc bbg bbo bbt bca bcb bcc bcg bco bct bga bgb bgc bgg bgo bgt boa bob boc bog boo bot bta btb btc btg bto btt c-- caa cab cac cag cao cat cba cbb cbc cbg cbo cbt cca ccb ccc ccg cco cct cga cgb cgc cgg cgo cgt co- coa cob coc cog coo cot cta ctb ctc ctg cto ctt gaa gab gac gag gao gat gba gbc gbg gbo gbt gca gcb gcc gcg gco gct gga ggb ggc ggg ggo ggt goa gob goc gog goo got gta gtb gtc gtg gto gtt oaa oab oac oag oao oat ob- oba obb obc obg obo obt oc- oca ocb occ ocg oco oct oga ogc ogg ogo ogt oo- ooa oob ooc oog ooo oot ot- ota otb otc otg oto ott taa tab tac tag tao tat tba tbb tbc tbg tbo tbt tca tcb tcc tcg tco tct tga tgb tgc tgg tgo tgt to- toa tob toc tog too tot tta ttb ttc ttg tto ttt