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(1) ¹«´ÜȾ´Ü Æí
https://www.youtube.com/watch?v=dOdalaL8dOs&feature=youtu.be
(2) ½ºÄðÁ¸Æí
https://www.youtube.com/watch?v=wGvgcVTutew&feature=youtu.be]
(3) ½ºÄðÁ¸ ¾ÈÀü¼öÄ¢
http://blog.naver.com/go_edu/222024703062