x\in U_x,\quad B\subset O_x,\quad U_x\cap O_x=\emptyset,\quad
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Recent Referers:
  1. http://formula.s21g.com/?x%5Cin%20U_x,%5Cquad%20B%5Csubse...
  2. http://formula.s21g.com/?x%5Cin%20U_x,%5Cquad%20B%5Csubse...
  3. https://mkprob.hatenablog.com/entry/20120912/1347448900
  4. http://formula.s21g.com/
  5. https://mkprob.hatenablog.com/