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Director GCHQ's Christmas Puzzle - Part 2



Q4. I was looking at a man on top of a hill using flag semaphore to send a message, but to me it looked like a very odd message. It began "ZGJJQ EZRXM" before seemingly ending with a hashtag. Which hashtag?

  1. #SGM
  2. #SEM
  3. #SEN
  4. #SGN
  5. #TEN
  6. #TGN