Convert Inline Footnotes to Regular Footnotes in Markdown

After using Hugo 0.25.1 for my personal website for nearly six years, I have finally decided to upgrade it. I’ll explain the reasons later. One problem I encountered was that I had to convert inline footnotes in Markdown to regular footnotes (because Hugo 0.25.1 supported the former but Hugo no longer supported it since a certain later version). That is, I need to convert

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