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Mathematical Expression Editor

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Inlclude XKCD.

If you open an xkcd link, e.g. https://xkcd.com/899/, you will see a note at the
bottom with the link. For this one, number_line is in the link for the image. Use the
\xkcd{} command, note that you need to use \detokenize{_} so underscores are
interpreted appropriately. E.g. \xkcd{number\detokenize{_}line}: