a-a a-c a-t aaa aac aao aat aav ac- aca acc aco act acv aoa aoc aoo aot aov at- ata atc ato att atv av- ava avc avo avt c-- caa cac cao cat cav cca ccc cco cct ccv co- coa coc coo cot cov cta ctc cto ctt ctv cva cvc cvo cvt cvv oaa oac oao oat oav oc- oca occ oco oct ocv oo- ooa ooc ooo oot oov ot- ota otc oto ott otv ov- ova ovc ovo ovv taa tac tao tat tav tca tcc tco tct tcv to- toa toc too tot tov tta ttc tto ttt ttv tva tvc tvo tvt v-a vaa vac vao vat vav vca vcc vco vct voa voc voo vot vov vta vtc vto vtt vtv vva vvc vvo vvt vvv