text: #!/usr/bin/env python3
  
  """Concatenate Variable Number of Input Lists.
  
  Create a function that concatenates n input lists, where n is variable.
  
  Lists should be concatenated in order of the arguments.
  
  Source:
  https://edabit.com/challenge/woA74HtrheoQva87R
  """
  
  
  def concat(*args) -> list:
      """Concatenates n input lists(*args), where n is variable."""
      # Create an empty list to return
      return_list = []
  
      # Add each list item in *args to the return_list.
      # += adds each item in i one by one.
      for i in args:
          return_list += i
  
      return return_list
  
  
  def main():
      """Run sample concat functions with assert statements. Do not import."""
      # Assert statements for 'concat'.
      assert concat([1, 2, 3], [4, 5], [6, 7]) == [1, 2, 3, 4, 5, 6, 7]
      assert concat([1], [2], [3], [4], [5], [6], [7]) == [1, 2, 3, 4, 5, 6, 7]
      assert concat([1, 2], [3, 4]) == [1, 2, 3, 4]
      assert concat([4, 4, 4, 4, 4]) == [4, 4, 4, 4, 4]
      assert concat(['a'], ['b', 'c']) == ['a', 'b', 'c']
      print("Function 'concat' completed successful.")
  
  
  if __name__ == "__main__":
      main()
  