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Feb 10th, 2016
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  1. Comparable<T> --> Animal --> Cat
  2. +---> Dog
  3.  
  4. Animal cat = new Cat();
  5. Animal dog = new Dog();
  6. cat.Compare(dog); // ERR
  7.  
  8. type Animal ... compare(cmp Self) ...
  9. type Cat ... compare(cmp Self) ...
  10. type Dog ... compare(cmp Self) ...
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