code: def _chain_from_iterable_of_lists(iterable):
      for item in iterable:
          item.reverse()
          while item:
              yield item.pop()
  
imports: import sys
  import time
  import functools
  import itertools
  import threading
  from ._base import Future
  from ._base import Executor
  from ._base import as_completed
  from .None import _core
label_desc: Use image node_id 4 for calling a global function with example usage: _chain_from_iterable_of_lists(iterable) without return types