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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 parse(self, response):
 """ Extracts the Rss Feed and initiates crawling it. :param obj response: The scrapy response """

        yield scrapy.Request(self.helper.url_extractor.get_rss_url(response),
                             callback=self.rss_parse)