expand ((x_2*x_3 + x_2*x_4 + x_3*x_4) * (x_1*x_3 + x_1*x_4 + x_3*x_4) * (x_1*x_2 + x_1*x_4 + x_2*x_4) * (x_1*x_2 + x_1*x_3 + x_2*x_3)-1/2*(x_1*x_2*x_3 + x_1*x_2*x_4 + x_1*x_3*x_4 + x_2*x_3*x_4)^2 * ((x_2*x_3 + x_2*x_4 + x_3*x_4) + (x_1*x_3 + x_1*x_4 + x_3*x_4) + (x_1*x_2 + x_1*x_4 + x_2*x_4) + (x_1*x_2 + x_1*x_3 + x_2*x_3))
)
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