http://math.uchicago.edu/~wald/con15a.pdf
http://math.uchicago.edu/~wald/con15b.pdf
http://math.uchicago.edu/~wald/con15c.pdf
http://math.uchicago.edu/~wald/con15d.pdf
(The cryptics I brought to the 2015 National Puzzlers' League convention; these are a three-puzzle suite and a separate puzzle for a 5K race that was held there.)
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