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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 insights(self):
 """ Access the Insights Twilio Domain :returns: Insights Twilio Domain :rtype: twilio.rest.insights.Insights """

        if self._insights is None:
            from twilio.rest.insights import Insights
            self._insights = Insights(self)
        return self._insights