text: #!/usr/bin/env python3
  
  """Find the Odd Integer.
  
  Create a function that takes a list and finds the integer 
  which appears an odd number of times.
  
  Source:
      https://edabit.com/challenge/9TcXrWEGH3DaCgPBs
  """
  
  from collections import Counter
  
  
  def find_odd(items: list) -> int:
      """Find the integer which appears an odd number of times.
  
      This function will find all integers that appear an odd number of times.
  
      Arguments:
          items {list} -- list of integers.
  
      Returns:
          int -- Integer which appears an odd number of times
  
      """
      c = Counter()
      c.update(items)
      return [k for k, v in c.items() if v % 2 > 0]
  
  
  def main():
      """Run find_odd samples."""
      print(find_odd([1, 1, 2, -2, 5, 2, 4, 4, -1, -2, 5, ]))
      print(find_odd([20, 1, 1, 2, 2, 3, 3, 5, 5, 4, 20, 4, 5, ]))
      print(find_odd([10, ]))
  
  
  if __name__ == "__main__":
      main()
  