{}_{z_{\alpha/2}}
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Recent Referers:
  1. http://formula.s21g.com/?%7B%7D_%7Bz_%7B%5Calpha/2%7D%7D
  2. http://formula.s21g.com/?%7b%7d_%7bz_%7b%5calpha/2%7d%7d
  3. http://blog.s21g.com/articles/2009.5.10
  4. http://genki.soup.io/since/20807567?mode=own
  5. http://genki.soup.io/since/15596190?newer=1