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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_version(self, layer_id, version_id, expand=[]):
 """ Get a specific version of a layer. """

        target_url = self.client.get_url('VERSION', 'GET', 'single', {'layer_id': layer_id, 'version_id': version_id})
        return self._get(target_url, expand=expand)