> Britain's most secretive organisation - GCHQ - has added a cryptic twist > to Christmas card season by including a baffling brainteaser.
This reminds me very much of the depiction of the recruitment process stipulated by "Alan Turing" in The Imitation Game, where a crossword puzzle was distributed via newspaper for talented citizens to solve, and subsequently be recruited for the war effort. The publication of such a puzzle by Hannigan is likely somehow linked with GCHQ's recruitment operations for their (less than desirable) positions in mathematical or cryptographic fields, or perhaps the monitoring of those with advanced mathematical ability.
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