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The first XKCD book contains a cipher puzzle. You can see it in this photo. This is the cipher text:
GJNHIYTOTNNNBSFOEVYYVT
NAQGYIUAEIEAIAEURFYV
GULGBIREOUKEGEAEEPFQ
VQTLEDVYSRNVNJULRNAQTVZOY
RVETOHRHEWSWHAGURJNO
RNYYZVZFDESFYIEIOPELJR
ERGUROBEBRLGNVNLSDKETEBI
Your challenge is to decipher it.
What is interesting is that, because it contains the image of the Reddit alien, it got picked up on Reddit and became a crowdsourcing activity. The full answer came in about three hours and is available here if you get stumped.
[[[Jump to previous test - How many of these people can you identify?]]]
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