code: def most_specific_common_supertype(self, others):
      if not others:
          return self
  
      if self._object == 2 and isinstance(others[0]._object, int):
          return MockSupertypes2With3(3)
      else:
          return None
  
imports: import collections
  from tensorflow.core.function.trace_type import default_types
  from tensorflow.core.function.trace_type import serialization
  from tensorflow.python.platform import test
  from tensorflow.python.types import trace
label_desc: Use image node_id 3 for calling the MockSupertypes2With3 obj's underlying member method code with example usage: obj.most_specific_common_supertype(others) and returns: self, MockSupertypes2With3, None