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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 taskrouter(self):
 """ Access the Taskrouter Twilio Domain :returns: Taskrouter Twilio Domain :rtype: twilio.rest.taskrouter.Taskrouter """

        if self._taskrouter is None:
            from twilio.rest.taskrouter import Taskrouter
            self._taskrouter = Taskrouter(self)
        return self._taskrouter