code: def include_many(gset, elems, truth_value=True):
      
      extend = getattr(gset, 'extend', None)
      if extend is not None:
          extend(elems)
      elif hasattr(gset, '__setitem__'):
          gset.update((elem, truth_value) for elem in elems)
      elif hasattr(gset, 'update'):
          gset.update(elems)
      else:
          raise Error("gset is not a supported container.")
docs: Do whatever it takes to make ``elem in gset`` true for each elem in ``elems``.
      
      See :func:`include`.