class_docstr: A transformation which applies each of a list of transformations,
  returning a set of all optoins.
  
  Args:
      transformations: The list of ``Transformation`` to apply.
code: def __call__(self, *args, **kwargs):
      new_attacked_texts = set()
      for transformation in self.transformations:
          new_attacked_texts.update(transformation(*args, **kwargs))
      return list(new_attacked_texts)
  
file_path: TextAttack/textattack/transformations/composite_transformation.py
imports: from textattack.shared import utils
  from textattack.transformations import Transformation
label_desc: Use image node_id 3 for calling the CompositeTransformation obj's underlying member method code with example usage: obj.__call__() and returns: list