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https://ja.wikipedia.org/wiki/%E6%97%A5%E6%9C%AC%E5%A4%A7%E5%AD%A6%E3%81%AE%E4%BA%BA%E7%89%A9%E4%B8%80%E8%A6%A7#%E8%91%97%E5%90%8D%E3%81%AA%E5%87%BA%E8%BA%AB%E8%80%85