|(t_n - t_{n-1})/(t_n - t_1)|<\delta
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Recent Referers:
  1. http://seesaawiki.jp/sginfo/d/171213eno
  2. http://seesaawiki.jp/sginfo/d/171205eno
  3. http://seesaawiki.jp/sginfo/e/edit?id=2056956