Tip: "Jiugongge" is a boundary in the history of calligraphy in China, also known as "Jiugongge", that is, draw several large squares on paper, and then divide nine small squares in each square to practice calligraphy by comparing the strokes of the model characters of French calligraphy.
Q: Who is the founder of Jiugongge?
A: Ou Yangxun.