x0:N(-2,2), x1:N(-2,2), x2:N(-2,2), x3:N(-2,2)
((((0.7 * x3) - (1.3 * x2)) + (1.1 * x1)) + (1.4 * ((((0.7 * x2) - (1.3 * x1)) + (1.1 * x0)) + ((1.4 * (((0.7 * x1) - (1.3 * x0)) + (1.4 * (0.7 * x0)))) - (0.7 * (0.7 * x0)))))) - (0.7 * (((0.7 * x1) - (1.3 * x0)) + (1.4 * (0.7 * x0))))
