docs: def included(powernode:str, inclusions:dict, nodes_only=False) -> iter:
      """Yield (power)nodes below given powernode (contained by it,
      or contained by a powernode contained by it, etc).
  
      >>> sorted(included('p1', {'p1': ('p2', 1), 'p2': (3,), 1: (), 3: ()}), key=str)
      [1, 3, 'p2']
      >>> sorted(included('p1', {'p1': ('p2', 1), 'p2': (3,), 1: (), 3: ()}, nodes_only=True), key=str)
      [1, 3]
  
      """
      if nodes_only:
          condition = lambda e: e != powernode and inclusions[e] == ()
      else:
          condition = lambda e: e != powernode
      yield from (elem for elem in utils.walk(powernode, (inclusions,))
                  if condition(elem))