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https://mattenn.fkgt.net/2015/08/youtube%e3%81%ae%e3%81%a8%e3%81%82%e3%82%8b%e5%8b%95%e7%94%bb%e3%81%a8%e6%95%b0%e5%b9%b4%e5%89%8d%e3%81%ae%e8%a9%b1/
Youtubeのとある動画と数年前の話