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Recent Referers:
http://formula.s21g.com/?E%5E%7B(%5Cnu)%7DR_c%3C%5Cinfty
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http://mkprob.hatenablog.com/entry/20130220/1361363246
http://d.hatena.ne.jp/mkprob/touch/20120920/1348137802
http://d.hatena.ne.jp/mkprob/20120920/1348137802
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