f(x)
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Recent Referers:
  1. http://formula.s21g.com/?f(x)
  2. http://formula.s21g.com/
  3. http://www.google.co.jp/
  4. http://s1--0---r.tumblr.com/page/3
  5. http://blog.naver.com/PostList.nhn?blogId=w_yuna&widgetTy...