a-a a-c aaa aac aae aao aav ac- aca acc ace aco acv aea aec aee aeo aev aoa aoc aoe aoo aov av- ava avc ave avo c-- caa cac cae cao cav cca ccc cce cco ccv ce- cea cec cee ceo cev co- coa coc coe coo cov cva cvc cve cvo cvv eaa eac eae eao eav ec- eca ecc ece eco ecv eea eec eee eeo eev eo- eoa eoc eoe eoo eva evc eve evo evv oaa oac oae oao oav oc- oca occ oco ocv oea oec oee oeo oo- ooa ooc ooo oov ov- ova ovc ove ovo ovv v-a v-e vaa vac vae vao vav vca vcc vce vco vea vec vee veo voa voc voe voo vov vva vvc vvo vvv