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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 autopilot(self):
 """ Access the Autopilot Twilio Domain :returns: Autopilot Twilio Domain :rtype: twilio.rest.autopilot.Autopilot """

        if self._autopilot is None:
            from twilio.rest.autopilot import Autopilot
            self._autopilot = Autopilot(self)
        return self._autopilot