code: def uniquify(seq):
      
  
      seen = set()
      seen_add = seen.add
      return [x for x in seq if x not in seen and not seen_add(x)]
docs: Return unique values in a list in the original order. See:  \
          http://www.peterbe.com/plog/uniqifiers-benchmark
  
      Args:
        seq (list): original list.
  
      Returns:
        list: list without duplicates preserving original order.