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http://www.asiae.co.kr/news/view.htm?idxno=2017122216011842565
http://www.etnews.com/20171221000224
http://news.mtn.co.kr/newscenter/news_viewer.mtn?gidx=2017122016564363477
http://www.etnews.com/20171220000111
http://news.mk.co.kr/newsRead.php?year=2017&no=826847
http://www.yonhapnews.co.kr/bulletin/2017/12/14/0200000000AKR20171214074700008.HTML?input=1195m
http://news.mk.co.kr/newsRead.php?year=2017&no=824240
http://www.asiae.co.kr/news/view.htm?idxno=2017120810352432932