P,\tilde{P}_T
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Recent Referers:
  1. http://formula.s21g.com/?P,%5Ctilde%7BP%7D_T
  2. http://formula.s21g.com/
  3. http://reader.livedoor.com/reader/
  4. http://mkprob.hatenablog.com/entry/2013/11/07/000227
  5. http://d.hatena.ne.jp/mkprob/