code: def find_target_paths(target_functions):
      
      # Create our results list
      results = set()
  
      # Loop for each target function
      for target_function in target_functions:
          results = results.union(__find_target_paths(target_function))
  
      return results
docs: Obtains all functions which can lead to any of the target functions being called.
      :param target_functions: The functions we are interested in reaching.
      :return: Returns a list of all functions which can reach any of the target_functions.