\delta >0
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Recent Referers:
  1. http://formula.s21g.com/?%5Cdelta%20%3E0
  2. https://mkprob.hatenablog.com/
  3. http://formula.s21g.com/
  4. http://formula.s21g.com/?%5Cdelta%20%3E0.png
  5. http://mkprob.hatenablog.com/