code: def testCombinationPairs(self):
      inputs = ["A", "B", "C"]
      expected_combination = [("A", "B"), ("A", "C"), ("B", "C")]
      actual_combination = paraphrase_ms_coco.create_combination(inputs)
      self.assertEqual(actual_combination, expected_combination)
  
file_path: tensor2tensor/tensor2tensor/data_generators/paraphrase_ms_coco_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import mock
  from tensor2tensor.data_generators import paraphrase_ms_coco
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling the ParaphraseGenerationProblemTest obj's underlying member method code with example usage: obj.testCombinationPairs() without return types