The secret formula for destroying the evil spirits is that Yinwu garrisoned the three evil spirits in the north, occupying the three sides of Haizi Chou. The three evil spirits of Siyou and Chou are in the east, occupying the three directions of Yinmao and Chen. Haimaowei Sansha is in the west, occupying Shenyou garrison in three directions. Shen Zichen's three evil spirits are in the south, occupying three directions of Siwu. This is also studied in traditional Feng Shui. In Yangzhai Feng Shui, there are many Feng Shui formulas circulated.