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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_instance(self, payload):
 """ Build an instance of DocumentInstance :param dict payload: Payload response from the API :returns: twilio.rest.preview.sync.service.document.DocumentInstance :rtype: twilio.rest.preview.sync.service.document.DocumentInstance """

        return DocumentInstance(self._version, payload, service_sid=self._solution['service_sid'], )