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Can you make a special challenge out of these locations?
https://www.europol.europa.eu/stopchildabuse
https://www.europol.europa.eu/stopchildabuse
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Firstly, look at the users who are consistently very good (even if only good in one area of the world).
Then, show those users an image interpol need identified. If the data then reveals a lot of guesses around the same location, it could be a match.