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https://sourceforge.net/p/industry-reports-2017-part1/code/ci/master/tree/2017%E4%B8%AD%E5%9B%BD%E2%80%9C%E4%BA%92%E8%81%94%E7%BD%91%2B%E4%BA%A4%E9%80%9A%E2%80%9D%E5%9F%8E%E5%B8%82%E6%8C%87%E6%95%B0%E7%A0%94%E7%A9%B6%E6%8A%A5%E5%91%8A_final.pdf?format=raw