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NCSC UK on X: "Our challenge to you this #WorldBookDay... How fast can you complete puzzle 221 on page 134 of the @GCHQ Puzzle Book II? Our best time will obviously be
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The GCHQ Puzzle Book, Bletchley Park Brainteasers, The Scotland Yard Puzzle Book, The Bumper Book of Would You Rather 4 Books Collection Set | The Book Bundle
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The GCHQ Puzzle Book II by GCHQ: Very Good Soft cover (2018) First Edition, First Printing. | Washburn Books
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