\langle X\rangle,\langle Y\rangle
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Recent Referers:
  1. http://formula.s21g.com/?%5Clangle%20X%5Crangle,%5Clangle...
  2. http://formula.s21g.com/
  3. http://d.hatena.ne.jp/mkprob/touch/searchdiary?word=%2A%5...
  4. http://d.hatena.ne.jp/mkprob/20120612
  5. http://d.hatena.ne.jp/mkprob/?of=28