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http://www.sankeibiz.jp/macro/news/150413/mca1504130500001-n1.htm

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http://www.courts.go.jp/app/hanrei_jp/detail4?id=85058

http://science.slashdot.jp/story/15/04/21/1848215/

http://www.sankei.com/affairs/news/150419/afr1504190001-n1.html

http://www.cnn.co.jp/usa/35063390.html

http://shimanami.way-nifty.com/rikoninaka/2015/04/post-5d8f.html

http://headlines.yahoo.co.jp/hl?a=20150422-00010005-saitama-l11

http://gigazine.net/news/20150421-twitter-direct-message-from-anyone/

http://www.excite.co.jp/News/odd/Karapaia_52189974.html

http://blogos.com/article/110422/

http://slashdot.jp/story/15/04/20/0954254/

http://www.sankei.com/affairs/news/150421/afr1504210040-n1.html

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http://www.nikkei.com/article/DGXLASDG20H1T_Q5A420C1CC0000/

http://headlines.yahoo.co.jp/hl?a=20150419-00010003-saitama-l11

http://kanz.jp/hanrei/detail/85051/

https://www.youtube.com/user/HeadisSports

http://headlines.yahoo.co.jp/hl?a=20150417-00000009-mai-soci

http://headlines.yahoo.co.jp/hl?a=20150418-00000022-san-l11

http://news.goo.ne.jp/article/yomiuri/nation/20150418-567-OYT1T50131.html

http://headlines.yahoo.co.jp/hl?a=20150417-00000029-kyt-l26

http://gigazine.net/news/20150418-alt-c-review/

http://www.yomiuri.co.jp/national/20150417-OYT1T50107.html

http://headlines.yahoo.co.jp/hl?a=20150417-00000002-asahik-soci

http://headlines.yahoo.co.jp/hl?a=20150417-00010002-fukui-l18

http://headlines.yahoo.co.jp/hl?a=20150418-00000029-mai-soci