... noted the most difficult individual PT sections in all three pre ... , 18-S2, 21-S3, F97-S3, 22-S4, 24-S2, 26-S2, 27-S1 ... , 28-S3, 33-S1, 39 ... , 13, 15, 18, 19, 21, F97, 26, 27, 28, 31, 32, ... challenging myself with doing the PT A, B, and C LG ...