... noted the most difficult individual PT sections in all three pre ... , 8-S4, 9-S2, 10-S4, 11-S4, 12-S4, 14-S2, 14-S4, 18-S2 ... , 48, 50, 51, 53, 59, 60, 61, 62, 63, 64, 66 ... , I would recommend against neglecting RC and perhaps even going through ...