O_{\beta}
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Recent Referers:
  1. http://formula.s21g.com/?O_%7B%5Cbeta%7D
  2. https://mkprob.hatenablog.com/entry/20120105/1325689583
  3. http://formula.s21g.com/
  4. http://d.hatena.ne.jp/
  5. http://mkprob.hatenablog.com/entries/2012/01/05