a-a a-c a-t aaa aac aae aao aat aax ac- aca acc ace aco act acx aea aec aee aeo aet aex aoa aoc aoe aoo aot aox at- ata atc ate ato att atx ax- axa axe axo axt axx c-- caa cac cae cao cat cax cca ccc cce cco cct ccx ce- cea cec cee ceo cet cex co- coa coc coe coo cot cox cta ctc cte cto ctt ctx cxc cxo cxt cxx eaa eac eae eao eat eax ec- eca ecc ece eco ect ecx eea eec eee eeo eet eex eo- eoa eoc eoe eoo eot eta etc ete eto ett etx ex- exa exc exe exo ext exx oaa oac oae oao oat oax oc- oca occ oco oct ocx oea oec oee oeo oet oex oo- ooa ooc ooo oot oox ot- ota otc ote oto ott ox- oxa oxc oxo oxt oxx t-x taa tac tae tao tat tax tca tcc tce tco tct tcx te- tea tec tee teo tet tex to- toa toc toe too tot tox tta ttc tte tto ttt ttx txe txt xaa xac xat xcx xee xet xex xoa xoc xoo xot xox xtc xtx xxo xxx