X,Y\in\mathcal{M}_2
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Recent Referers:
  1. http://formula.s21g.com/?X,Y%5Cin%5Cmathcal%7BM%7D_2
  2. https://mkprob.hatenablog.com/?page=1339637912
  3. https://mkprob.hatenablog.com/archive/2012/06/12
  4. https://mkprob.hatenablog.com/entry/20120612/1339497600
  5. https://formula.s21g.com/?X,Y%5Cin%5Cmathcal%7BM%7D_2.png