Xian Guozhi, where is the NPC?

Chapter 1: The middle of the upper left wall of Nanpi (coordinates 14-24), 1-2 star skill book, with a probability of 2 stars.

Chapter 2: Liu Chen rightmost middle (coordinate 20-5), 2-3-star skill book, with a probability of 3 stars.

Chapter 3: The moat in the lower right corner of Xiapi (coordinates 32-23) is 3-4 stars, with a probability of 4 stars.

Chapter 4: On the left side of the big house in the upper left corner of Xuchang (coordinate 2-22), there are 4-5 star books with a probability of 5 stars.