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Recent Referers:
  1. http://formula.s21g.com/?n
  2. http://blog.s21g.com/articles/2012.8
  3. http://blog.s21g.com/articles/2012.9
  4. http://translate.googleusercontent.com/translate_c?depth=...
  5. http://plaza.rakuten.co.jp/actuarymath/backnumber/200808/