x\not\in K
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Recent Referers:
  1. http://formula.s21g.com/?x%5Cnot%5Cin%20K
  2. https://mkprob.hatenablog.com/entry/20120831/1346379231
  3. http://formula.s21g.com/
  4. http://d.hatena.ne.jp/mkprob/touch/searchdiary?word=%A5%B...
  5. http://d.hatena.ne.jp/mkprob/touch/searchdiary?word=*%5B%...