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Your current document has the following errors or problems: \mathbbC} -> \mathbb{C}; changes does not define \delete, only \deleted; You need to define the author/id MD as a "change author" before you can use it, so you need \definechangesauthor[<options>]{MD} after loading \usepackage{changes}; It's not advised to use \\ for a paragraph break. Leave ...

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The error message "Missing \begin{document}" means that you are missing a \begin{document} to begin your document. Google could have told you that, by the way. Please refer to https://en.wikibooks.org/wiki/LaTeX/Document_Structure for more information.

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