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四兽第八十二
南有污池为朱雀，北有堆阜为玄武，东有丛林为青龙，西有大道为白虎。四兽既具，八卦既列，乃立表测影，以定子午之位（立表法在前）。若夫朱雀无顶，不可居也；玄武折足，不可居也；白虎衔刀，不可居也；青龙悲哭，不可居也。强居之者，军覆将死。
虎钤经 · 许洞 · Chapter 91 of 218
四兽第八十二
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