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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 verify(self):
 """ Access the Verify Twilio Domain :returns: Verify Twilio Domain :rtype: twilio.rest.verify.Verify """

        if self._verify is None:
            from twilio.rest.verify import Verify
            self._verify = Verify(self)
        return self._verify