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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 list_images(self):
 # type: () -> List[str] """ List images stored in the registry. Returns: list[str]: List of image names. """

        r = self.get(self.registry_url + '/v2/_catalog', auth=self.auth)
        return r.json()['repositories']