a^*\cap F_1\neq \emptyset,\ a^*\cap F_2\neq \emptyset
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Recent Referers:
  1. http://formula.s21g.com/?a%5E*%5Ccap%20F_1%5Cneq%20%5Cemp...
  2. http://formula.s21g.com/
  3. http://mkprob.hatenablog.com/
  4. http://d.hatena.ne.jp/mkprob/touch/201202
  5. http://d.hatena.ne.jp/mkprob/?of=40