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1)¹«´ÜȾ´ÜÆí : https://www.youtube.com/watch?v=dOdalaL8dOs&feature=youtu.be
2)½ºÄðÁ¸Æí : https://www.youtube.com/watch?v=wGvgcVTutew&feature=youtu.be
³ª. ½ºÄðÁ¸ ¾ÈÀü¼öÄ¢ °ü·Ã È«º¸ : https://blog.naver.com/go_edu/222024703062