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https://hoko.yataiki.net/2016/09/23/%e6%9b%b8%e4%bd%9c%ef%bc%9a%e8%b2%9e%e8%a6%b3%e6%94%bf%e8%a6%81%e3%83%bb%e4%b8%83/
書作:貞観政要・七