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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 doFlush(self, cname, flushExpression, flushType):
 """ doFlush method enables specific content to be "flushed" from the cache servers. * Note: The flush API is limited to 1,000 flush invocations per hour (each flush invocation may include several objects). * """

        return self.client.service.doFlush(
            cname, flushExpression, flushType)