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分守第二十三
守备不可不讲。善守者如环，使敌不得其间而入焉。夫人之治身者，血脉往来通畅于四肢，则安宁矣。或一脉不来，一气不通，未有免于病者。是以善用兵者，虽四屯急难，则如首尾相顾而不穷，斯为妙矣。
虎钤经 · 许洞 · Chapter 21 of 218
分守第二十三
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