There is a dam road between East Lake and West Lake in yuyuantan park. At the southern end of the road, there is an Artest Tai Ji Chuan tutoring station located in Haidian District, where Professor Tai Ji Chuan teaches. I learned formula 24, 48 and 42 there. Tuition is 20 per class-25 yuan. The time is before nine o'clock every morning. Usually a new class is held every month.