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http://joone.net/2016/12/05/4-%ec%b4%88%ec%b0%bd%ea%b8%b0-%ed%94%84%eb%a1%9c%ea%b7%b8%eb%9e%98%eb%b0%8d/
4. 처음에는 어떻게 프로그래밍을 했을까?