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GCHQ on Twitter: "Proceeds from the GCHQ #Puzzle Book 2 go to support mental health charity @Heads_Together. Has the #GCHQPuzzle got you in the mood for more #puzzles?… https://t.co/RqBSkRLP8v"
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The GCHQ Puzzle Book : Perfect for anyone who likes a good headscratcher: GCHQ: 9780718185541: hive.co.uk
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