a_1^*\cap a_2^*
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Recent Referers:
  1. http://formula.s21g.com/?a_1%5E*%5Ccap%20a_2%5E*
  2. http://formula.s21g.com/
  3. http://d.hatena.ne.jp/mkprob/?of=40
  4. http://d.hatena.ne.jp/mkprob/20120226
  5. http://d.hatena.ne.jp/mkprob/20120317/1331988256