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https://blog.schee.info/2006/02/19/%e7%9c%8b%e4%be%86%e8%a6%81%e8%b7%91%e9%81%94%e5%8d%a1%e9%82%84%e6%9c%89%e9%80%99%e5%80%8b%e8%a7%a3%e6%b3%95/
看來要跑達卡還有這個解法