code: def contractions(cls):
      def _contractions(x):
          conts = Perturb.contractions(x[1])
          return [(x[0], a) for a in conts]
  
      return _contractions
  
imports: from typing import Optional, Iterable, Tuple, Union
  import itertools
  import numpy
  from checklist.editor import MunchWithAdd
  from checklist.test_suite import TestSuite
  from checklist.test_types import MFT
  from checklist.perturb import Perturb
  from allennlp.confidence_checks.task_checklists.task_suite import TaskSuite
  from allennlp.confidence_checks.task_checklists import utils
  from allennlp.predictors import Predictor
label_desc: Use image node_id 4 for calling the QuestionAnsweringSuite obj's underlying member method code with example usage: obj.contractions(cls) and returns: _contractions, unknown