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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 direct(self):
 """ Direct inbox feed, contains activities addressed directly to the owner of the inbox. """

        url = self._subfeed("direct")
        if "direct" in self.url or "major" in self.url or "minor" in self.url:
            return self
        if self._direct is None:
            self._direct = self.__class__(url, pypump=self._pump)
        return self._direct