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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 ActivityContext :param sid: The sid :returns: twilio.rest.taskrouter.v1.workspace.activity.ActivityContext :rtype: twilio.rest.taskrouter.v1.workspace.activity.ActivityContext """

        return ActivityContext(self._version, workspace_sid=self._solution['workspace_sid'], sid=sid, )