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• Q: What's yellow and equivalent to the Axiom of Choice. A: Zorn's Lemon.
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• Q: What's purple and commutes? A: An abelian grape.
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• Q: What is purple and commutative? A: An abelian grape...
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• Q: What's yellow, ugly and sleeps alone? A: Yoko Ono.
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• Q. What did Saddam Hussein say when he was asked about Red China?
  A. He said, "I'd use a purple tablecloth.......