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Paul Hsieh's Puzzles

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Description: Logical and mathematical brain teasers, with an indication of difficulty. Hints are provided; solutions are available by email.
These are a bunch of brain teasers, ranging in difficulty from moderate to very hard. There are hints if you need them and you can contact me for the answers if you have a desperate need to know them. Puzzles marked with a
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Creation Date: 04-jul-1999
Expiration Date: 04-jul-2015