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GCHQ Christmas card answers revealed as director reveals no one cracked it, despite three people getting close - Mirror Online
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![GCHQ release puzzle book filled with 'world's hardest brain teasers' for Christmas | The Independent | The Independent GCHQ release puzzle book filled with 'world's hardest brain teasers' for Christmas | The Independent | The Independent](https://static.independent.co.uk/s3fs-public/thumbnails/image/2016/10/19/09/gchq-puzzles.jpg)
GCHQ release puzzle book filled with 'world's hardest brain teasers' for Christmas | The Independent | The Independent
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