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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 SSLCertificates(self):
 """ Lists certificates. """

        url = self._url + "/SSLCertificate"
        params = {"f" : "json"}
        return self._post(url=url,
                          param_dict=params,
                          proxy_url=self._proxy_url,
                          proxy_port=self._proxy_port)