x>0
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Recent Referers:
  1. http://formula.s21g.com/?x%3E0
  2. https://mkprob.hatenablog.com/entry/20120726/1343262108
  3. http://formula.s21g.com/
  4. http://d.hatena.ne.jp/mkprob/?of=16
  5. http://d.hatena.ne.jp/mkprob/touch/20120726/1343262108