Column ABC has a uniform rectangular cross section with b = 12 mm and d = 22 mm. The column is braced in the xz plane at its midpoint C and carries a centric load P of magnitude 3.9 kN. Knowing that a factor of safety of 3.2 is required, determine the largest allowable length L. Use E = 200 GPa. Neglect the rotational stiffness of the bracing in the xz plane and the lateral stiffness of the bracing in the yz plane. (Round the final answer to the nearest whole number.)

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