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The GCHQ Puzzle Book
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The GCHQ Puzzle Book
Gallery: Challenge yourself to some of the GCHQ's toughest puzzles | TechRepublic
Think you're a code-breaker? Try these GCHQ puzzles | ITV News
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GCHQ donates £240,000 to Heads Together from puzzle book... - GCHQ.GOV.UK
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GCHQ publishes book of spies' brainteasers for children | GCHQ | The Guardian
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The GCHQ Puzzle Book [Review] – Lock Me If You Can
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