Z_t^{(2)}=X_t-Y_t
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Recent Referers:
  1. http://formula.s21g.com/?Z_t%5E%7B(2)%7D%3DX_t-Y_t
  2. https://mkprob.hatenablog.com/entry/20120607/1339040164
  3. http://formula.s21g.com/
  4. http://d.hatena.ne.jp/
  5. http://d.hatena.ne.jp/mkprob/?of=28