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Aug 28th, 2014
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  1. a = [1,2,3]
  2. b = [3,4,5]
  3.  
  4. a&b #=> [3]
  5. b - a&b #=> [4,5]
  6. b - a #=> [4,5]
  7.  
  8. [1,2,3] - [3] #=> [1,2]
  9.  
  10. a - a&b #=> [] ??
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