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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 get(self, sid):
 """ Constructs a AlphaSenderContext :param sid: The sid :returns: twilio.rest.messaging.v1.service.alpha_sender.AlphaSenderContext :rtype: twilio.rest.messaging.v1.service.alpha_sender.AlphaSenderContext """

        return AlphaSenderContext(self._version, service_sid=self._solution['service_sid'], sid=sid, )