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I spy ... another fiendishly difficult GCHQ puzzle book | GCHQ | The Guardian
NCSC UK on Twitter: "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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GCHQ donates £240,000 to Heads Together from puzzle book... - GCHQ.GOV.UK
Author: GCHQ
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GCHQ: Nobody got crypto Christmas puzzle correct | WIRED UK
Budding code-breakers put skills to test as GCHQ launches puzzle book | BelfastTelegraph.co.uk
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GCHQ publishes book of spies' brainteasers for children | GCHQ | The Guardian
