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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 queries(self):
 """ Access the queries :returns: twilio.rest.autopilot.v1.assistant.query.QueryList :rtype: twilio.rest.autopilot.v1.assistant.query.QueryList """

        if self._queries is None:
            self._queries = QueryList(self._version, assistant_sid=self._solution['sid'], )
        return self._queries