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A comment on RegEx Crossword - Sudoku-like Regular Expression Puzzles.

Re:RegEx Crossword - Sudoku-like Regular Expression Puzzles by calebegg on Wednesday July 17, 2013 @12:54AM (#6056161)
Here's a really enjoyable regex crossword from, as I recall, the MIT Mystery Hunt:

http://www.coinheist.com/rubik/a_regular_crossword/grid.pdf

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