Welcome to the Question2Answer Q&A. There's also a demo if you just want to try it out.
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Q2A version: 1.81
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Give a couple of examples, the urls.

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How about turning on the check feature for similar questions?
Admin > Posting > Check for similar questions when asking

Matching range may need to be changed to suit your situation.
Admin > Posting > Similar questions matching
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Filter the duplicates and delete it or change it
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