Test of some factorization properties from the comparison of the reactions $\pi^{\pm}$ p -> $\pi^{\pm} \pi^{+} \pi^{-} \pi^{0}$ p and $\pi^{\pm}$ p -> $\pi^{\pm} \pi^{+} \pi^{-} \pi^{+}$ n at 11.5 GeV/c

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