Defining x0, x1, x2, x3, x4, x5, x6, x7
x0*x1*x2*x3*x4*x5*x6*x7 + x0*x1*x2*x3*x4*x5*x6 + x0*x1*x2*x3*x4*x5*x7 + x0*x1*x2*x3*x4*x6*x7 + x0*x1*x2*x3*x5*x6*x7 + x0*x1*x2*x4*x5*x6*x7 + x0*x1*x3*x4*x5*x6*x7 + x0*x2*x3*x4*x5*x6*x7 + x1*x2*x3*x4*x5*x6*x7 + x0*x1*x2*x3*x4*x6 + x0*x1*x2*x4*x5*x6 + x1*x2*x3*x4*x5*x7 + x0*x2*x3*x4*x6*x7 + x0*x1*x3*x5*x6*x7 + x0*x2*x4*x5*x6*x7 + x0*x1*x2*x3*x5 + x0*x1*x3*x4*x5 + x0*x2*x3*x4*x5 + x0*x1*x2*x4*x6 + x0*x2*x3*x4*x6 + x0*x2*x3*x5*x6 + x0*x2*x4*x5*x6 + x0*x3*x4*x5*x6 + x2*x3*x4*x5*x6 + x0*x1*x2*x3*x7 + x0*x1*x2*x4*x7 + x0*x1*x4*x5*x7 + x0*x1*x2*x6*x7 + x1*x2*x3*x6*x7 + x0*x1*x4*x6*x7 + x0*x2*x4*x6*x7 + x1*x2*x4*x6*x7 + x2*x3*x5*x6*x7 + x1*x4*x5*x6*x7 + x3*x4*x5*x6*x7 + x0*x1*x2*x3 + x0*x1*x3*x5 + x0*x2*x3*x5 + x0*x1*x4*x5 + x0*x3*x4*x5 + x2*x3*x4*x5 + x0*x2*x4*x6 + x0*x3*x5*x6 + x2*x3*x5*x6 + x3*x4*x5*x6 + x0*x1*x2*x7 + x1*x2*x3*x7 + x0*x1*x4*x7 + x1*x2*x4*x7 + x1*x4*x5*x7 + x0*x1*x6*x7 + x1*x2*x6*x7 + x2*x3*x6*x7 + x1*x4*x6*x7 + x3*x5*x6*x7 + x4*x5*x6*x7 + x0*x3*x5 + x3*x5*x6 + x1*x2*x7 + x1*x4*x7 + x0*x1 + x2*x3 + x4*x5 + x6*x7 + 1