05:25 GMT05 December 2020
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    Normally when we think about a puzzle book what springs to mind is simple crosswords or brain teasers. That's changed now as GCHQ, the UK government intelligence agency, has just released a book of codes that everyone's invited to break.


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    solutions, code, puzzle, questions, charity, intelligence, British Government Communications Headquarters (GCHQ), Great Britain, United Kingdom
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