a\in a_2^*
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Recent Referers:
  1. http://formula.s21g.com/?a%5Cin%20a_2%5E*.png
  2. http://formula.s21g.com/?a%5Cin%20a_2%5E*
  3. https://mkprob.hatenablog.com/entry/20120226/1330249108
  4. http://formula.s21g.com/
  5. http://d.hatena.ne.jp/mkprob/touch/201202