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https://github.com/it-ebooks/industry-reports-2017-part1/raw/master/%E3%80%90%E9%87%8D%E7%A3%85%E3%80%91%E7%99%BE%E9%A1%B5%E8%AF%A6%E8%A7%A3%EF%BC%9A%E3%80%8A%E4%BA%91%E6%9C%8D%E5%8A%A1%E9%87%8D%E6%9E%84%E6%96%B0%E9%9B%B6%E5%94%AE%E3%80%8B.pdf