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Recent Referers:
  1. http://formula.s21g.com/?x%5E*.png
  2. https://formula.s21g.com/formulae/26371
  3. http://formula.s21g.com/?x%5E*
  4. http://formula.s21g.com/
  5. http://d.hatena.ne.jp/mkprob/touch/201202