C45 Calculation of Sand Division Xu Yunfeng's Turbid Dispersion

"My memory is a mess." Faang Zhuo said, "I remember that this is the first time I've seen Big Brother Xu when I followed you to Wudang Mountain, and the last time was in Beijing. I only know that you two were good brothers, and that you guys were very good to me, that you guys liked to argue, and that Senior Brother Wang's master died, and you two brothers fought