code: def concat_list(in_list):
      """Concatenate a list of list into a single list.
  
      Args:
          in_list (list): The list of list to be merged.
  
      Returns:
          list: The concatenated flat list.
      """
      return list(itertools.chain(*in_list))
  
imports: import collections.abc
  import functools
  import itertools
  import subprocess
  import warnings
  from collections import abc
  from importlib import import_module
  from inspect import getfullargspec
  from itertools import repeat
label_desc: Use image node_id 11 for calling a global function with example usage: concat_list(in_list) and returns: list