M_t^f
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Recent Referers:
  1. http://formula.s21g.com/?M_t%5Ef
  2. http://formula.s21g.com/
  3. http://mkprob.hatenablog.com/entry/20130220/1361363246
  4. http://d.hatena.ne.jp/mkprob/20130220/1361363246
  5. http://d.hatena.ne.jp/