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https://ja.wikipedia.org/wiki/%E3%82%AB%E3%83%88%E3%83%AA%E3%83%83%E3%82%AF%E6%95%99%E4%BC%9A%E3%81%AE%E6%80%A7%E7%9A%84%E8%99%90%E5%BE%85%E4%BA%8B%E4%BB%B6