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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 wireless(self):
 """ Access the Wireless Twilio Domain :returns: Wireless Twilio Domain :rtype: twilio.rest.wireless.Wireless """

        if self._wireless is None:
            from twilio.rest.wireless import Wireless
            self._wireless = Wireless(self)
        return self._wireless