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From Rude Duck, 7 Years ago, written in Python.
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  1. def number_of_occuriences(elem, sequence):
  2.     return len([x for x in sequence if x == elem])
  3.  
  4. def unique_sequence(A, B):
  5.     return [x for x in A if number_of_occuriences(x, B) < 2]
  6.