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It looks like the extra text is right above your closing </body> tag, most likely in the theme.liquid. To help speed up your search you can use the find command using Control+F" (or "Command+F" on a Mac) when you're in the file. This will bring up a search bar in which you can enter "s" - the quotation marks will enable the boolean search operator to find an exact match.
If not found in the theme.liquid, also double check the index.liquid! I trust that does the trick, but let me know if anything else comes up.
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