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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 engagements(self):
 """ Access the engagements :returns: twilio.rest.studio.v1.flow.engagement.EngagementList :rtype: twilio.rest.studio.v1.flow.engagement.EngagementList """

        if self._engagements is None:
            self._engagements = EngagementList(self._version, flow_sid=self._solution['sid'], )
        return self._engagements