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The New York Times has introduced a documentary audio series that follows Rukmini Callimachi, who covers terrorism for The Times, on her quest to understand ISIS. Today, as a special episode of \u201cThe Daily,\u201d we offer Chapter 4 of \u201cCaliphate,\u201d in which a new recruit proves his worth and gets invited to a secret meeting. For more information about the series, visit nytimes.com/caliphate.\n\nThis episode includes disturbing language and scenes of graphic violence.