X:=\prod_{j=1}^3{\rm sgn}(W_1^{(j)})
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Recent Referers:
  1. http://formula.s21g.com/?X:%3D%5Cprod_%7Bj%3D1%7D%5E3%7B%...
  2. http://formula.s21g.com/
  3. http://mkprob.hatenablog.com/?page=1343480443
  4. http://d.hatena.ne.jp/mkprob/201206