{\rm grad}f=0
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Recent Referers:
  1. http://formula.s21g.com/?%7B%5Crm%20grad%7Df%3D0.png
  2. http://formula.s21g.com/?%7B%5Crm%20grad%7Df%3D0
  3. https://mkprob.hatenablog.com/entry/20120303/1330759613
  4. https://mkprob.hatenablog.com/
  5. http://formula.s21g.com/