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How do we format subscript and superscript numbers?
For example, I've referred to SO2 a few times, and someone has already edited an answer of mine and converted the '2' to subscript.
I'm not sure whether there's a Markdown way to do it, but Stackexchange allows you to just use the HTML <sub> and <sup> tags.
CO<sub>2</sub> and mv<sup>2</sup>
CO2 and mv2 respectively.