a-a a-c a-t aaa aac aae aat aav aax ac- aca acc ace act acv acx aea aec aee aet aev aex at- ata atc ate att atv atx av- ava avc ave avt avx ax- axa axe axt axv axx c-- caa cac cae cat cav cax cca ccc cce cct ccv ccx ce- cea cec cee cet cev cex cta ctc cte ctt ctv ctx cva cvc cve cvt cvv cvx cxc cxt cxv cxx eaa eac eae eat eav eax ec- eca ecc ece ect ecv ecx eea eec eee eet eev eex eta etc ete ett etv etx eva evc eve evt evv ex- exa exc exe ext exx t-x taa tac tae tat tav tax tca tcc tce tct tcv tcx te- tea tec tee tet tev tex tta ttc tte ttt ttv ttx tva tvc tve tvt tvx txe txt v-a v-e vaa vac vae vat vav vax vca vcc vce vct vcx vea vec vee vet vex vta vtc vte vtt vtv vtx vva vvc vvt vvv vxa vxv xaa xac xat xav xcv xcx xee xet xev xex xtc xtv xtx xvt xxv xxx