Observation of $\eta^{\prime}\to\pi^{+}\pi^{-}\pi^{+}\pi^{-}$ and $\eta^{\prime}\to\pi^{+}\pi^{-}\pi^{0}\pi^{0}$

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With the same approach as for J / ψ J/\psi events taken in 2009 (see Ref. data1 for more details), the preliminary number of J / ψ J/\psi events taken in 2009 and 2012 is determined to be 1310.6 × 10 6 1310.6\times 10^{6} with an uncertainty of 0.8%

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