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The Bookseller - Rights - Duke and Duchess of Cambridge pen foreword for Puffin and GCHQ puzzle book
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The GCHQ Puzzle Book Collection 2 Books Set: Amazon.co.uk: GCHQ, The GCHQ Puzzle Book by GCHQ, 978-0718185541, 0718185544, 9780718185541, The GCHQ Puzzle Book II by GCHQ, 978-0241365434, 0241365430, 9780241365434: 9789123912735: Books
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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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GCHQ release puzzle book filled with 'world's hardest brain teasers' for Christmas | The Independent | The Independent
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