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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 get(self, sid):
 """ Constructs a CertificateContext :param sid: A string that uniquely identifies the Certificate. :returns: twilio.rest.preview.deployed_devices.fleet.certificate.CertificateContext :rtype: twilio.rest.preview.deployed_devices.fleet.certificate.CertificateContext """

        return CertificateContext(self._version, fleet_sid=self._solution['fleet_sid'], sid=sid, )