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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 feedback_summaries(self):
 """ Access the feedback_summaries :returns: twilio.rest.api.v2010.account.call.feedback_summary.FeedbackSummaryList :rtype: twilio.rest.api.v2010.account.call.feedback_summary.FeedbackSummaryList """

        if self._feedback_summaries is None:
            self._feedback_summaries = FeedbackSummaryList(
                self._version,
                account_sid=self._solution['account_sid'],
            )
        return self._feedback_summaries