Evaluate elementary symmetric function, i.e., e(v,k) = e(x_1,x_2,x_3,1) = (x_1+x_2+x_3), or e(x_1,x_2,x_3,2) = (x_1*x_2+x_2*x_3+x_3*x_1) or,e(x_1,x_2,x_3,3) = (x_1*x_2*x_3).
1 | el_symmetric(values, k)
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