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Nov 26th, 2014
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  1. a = [7, 5, 5, 4]
  2. b = list(itertools.combinations(a, 2))
  3.  
  4. # b = [(7, 5), (7, 5), (7, 4), (5, 5), (5, 4), (5, 4)]
  5.  
  6. index = [(0, 1), (0, 2), (0, 3), (1, 2), (1, 3), (2, 3)]
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