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https://www.cia.gov/library/center-for-the-study-of-intelligence/kent-csi/vol40no5/pdf/v40i5a09p.pdf&ved=2ahUKEwiyqZCttIvpAhWLQs0KHd8kBIsQFjAAegQIBxAC&usg=AOvVaw3npmsCkQ16tlnDB_VAczUT