See if you can solve these fiendish brain-teasers written by GCHQ spies
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GCHQ
Snazzy.
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GCHQ, one of the UK's spy agencies, is publishing a "Puzzle Book" of riddles and brain-teasers written by British spooks.
The puzzles range from mathematical riddlers to lateral thinking problems and photo-association games.
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The book is being published by Penguin for £12.99, and is out now.
We've republished three of the puzzles below. Have a go at each one, and when you think you've got it (or you give up), then scroll down for the answer.
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Good luck!
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