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viewimage.php?id=20bcc42e&no=24b0d769e1d32ca73dec82fa11d02831d5ca5516da218d33b13f2760ba1e5b28ce3b9945669d29c00d2d51f4a3ce64935d44f5655548a27699f8ca76abf6419eb679583755adf7e14b8a8e0413941ebf38ab40e4e939f7e1b0e1e8396ed60d91387855141d2fc70fd7dd13a36a3052

영역 r이 r2로 바뀔때
저거 원리를 이해를 못하겠습니다...
고딩때 배운것같은데 까먹었어요...