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All the Perl that's Practical to Extract and Report
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If you like this sort of puzzle (Score:1)
Sometimes these are called knights-and-knaves puzzles (knights always tell the truth, knaves always lie). If you like them, you should really read some of Raymond Smullyan's [wikipedia.org] books. He's come up with tons and tons of interesting variations.
My favorite puzzle book of his is "What Is the Name of This Book?", although I haven't read some of his newer ones.
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