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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 update(self, status=values.unset):
 """ Update the FaxInstance :param FaxInstance.UpdateStatus status: The new status of the resource :returns: Updated FaxInstance :rtype: twilio.rest.fax.v1.fax.FaxInstance """

        return self._proxy.update(status=status, )