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http://www.itcle.com/2015/12/30/%EC%82%BC%EC%84%B1%EC%9D%98-%ED%8A%B9%ED%97%88-%EC%B6%9C%EC%9B%90-%EC%8A%A4%EB%A7%88%ED%8A%B8-%EB%A7%81-%EC%95%85%EC%84%B8%EC%82%AC%EB%A6%AC-%EA%B0%9C%EB%B0%9C-%EA%B3%84%ED%9A%8D-%EC%95%94%EC%8B%9C/