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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 notify(self):
 """ Access the Notify Twilio Domain :returns: Notify Twilio Domain :rtype: twilio.rest.notify.Notify """

        if self._notify is None:
            from twilio.rest.notify import Notify
            self._notify = Notify(self)
        return self._notify