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http://joone.net/2018/04/02/21-%ec%9e%90%ec%9c%a0%ec%86%8c%ed%94%84%ed%8a%b8%ec%9b%a8%ec%96%b4-%ec%9e%ac%eb%8b%a8/
21. 자유 소프트웨어 재단