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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def HumanReadableStartType(self):
 """Return a human readable string describing the start type value. Returns: str: human readable description of the start type value. """

    if isinstance(self.start_type, py2to3.STRING_TYPES):
      return self.start_type
    return human_readable_service_enums.SERVICE_ENUMS['Start'].get(
        self.start_type, '{0:d}'.format(self.start_type))