Letter of intent to study the reactions $\gamma p \to p\pi^{+}\pi^{-}\pi^{0}, p\pi^{+}\pi^{-}\pi^{0}\pi^{0} pK^{+}K^{-}\pi^{0}, pK^{+}K^{-}\pi^{0}\pi^{0}$ in the energy range E$\gamma$ = 20-50 GeV

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