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<https://anno-yoshinashi.hatenablog.jp/archive/category/%E6%97%A5%E8%A8%98%E3%83%BB%E3%82%B3%E3%83%A9%E3%83%A0%E3%83%BB%E3%81%A4%E3%81%B6%E3%82%84%E3%81%8D>
<https://anno-yoshinashi.hatenablog.jp/entry/2014/03/02/203205>