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三叶结，解结数是1，即翻转1个交叉点的绳子上下关系，可把纽结转换为平凡结：本次反例中的7个交叉点的环面纽结：15个交叉点，解结数为2的纽结：14个交叉点，解结数（最多）为5 的纽结：微信公众号：搜“大老李聊数学”知乎：搜level 10的“大老李”
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