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All the Perl that's Practical to Extract and Report

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  • You should definitely pick up a book or two by Raymond Smullyan. He's the absolute king of knights-and-knaves puzzles and variations on them: humans who sometimes lie, vampires who lie when it's daylight but tell the truth otherwise, sane and insane versions of all -- e.g., insane knights always tell the truth, but believe every true proposition to be false -- and many others.

    A good place to start would be What is the name of this book? [] or Riddle of Scheherazade []. I liked the former a lot more. It goes from the puzzles to Goedel's incompleteness theorem in a very fun way.