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The GCHQ Puzzle Book: Perfect for anyone who likes a good headscratcher eBook : GCHQ: Amazon.ca: Kindle Store
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With just three days left to crack GCHQ's 'impossible' puzzle, will you be the first person to solve the code? - Mirror Online
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Fancy yourself as the next James Bond? UK spy agency GCHQ launches new codebreaker competition - Mirror Online
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Puzzles for Spies: The brand-new puzzle book from GCHQ: GCHQ, HRH Prince William of Wales, Princess of Wales: 9780241579909: Amazon.com: Books
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