This query is AMAZING. You can replace the_donald with any other subreddit. You might have a query like it already.
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Pastebin link so you can copy and paste it. You may be able to improve on it a bit.
pastebin.com/pdwYHuma
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This is a better version (It looks at just a subreddit and everything but that subreddit) pastebin.com/uWGTUhPD