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https://theartofmantis.com/2019/08/27/good-and-not-so-good-self-defence-%e5%a5%bd%e8%88%87%e3%80%8c%e4%b8%8d%e5%a4%aa%e5%a5%bd%e3%80%8d%e7%9a%84%e8%87%aa%e8%a1%9b%e8%a1%93/
Good and "Not-So-Good" Self-Defence 好與「不太好」的自衛術