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http://headlines.yahoo.co.jp/hl?a=20151016-00000099-jij-soci http://news.livedoor.com/article/detail/10716087/ http://dw.diamond.ne.jp/articles/-/11590

https://www.u-presscenter.jp/modules/bulletin/index.php?page=article&storyid=8567

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http://blog.livedoor.jp/takeda_cfo/archives/2053244.html

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https://www.ilp.fukuoka-u.ac.jp/_cms_dir/wp-content/uploads/2015/10/383812b59c70ce6dc0677b4795fbe28a.pdf

http://matimura.cocolog-nifty.com/matimulog/2015/10/decisiontweet-7.html

http://www.yuhikaku.co.jp/books/series_search/130

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