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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 connect_apps(self):
 """ Access the connect_apps :returns: twilio.rest.api.v2010.account.connect_app.ConnectAppList :rtype: twilio.rest.api.v2010.account.connect_app.ConnectAppList """

        if self._connect_apps is None:
            self._connect_apps = ConnectAppList(self._version, account_sid=self._solution['sid'], )
        return self._connect_apps