x^4 - x^3 - 2*x^2 + 4*x + 16 x^4 - x^3 + 11*x + 5 x^4 - x^3 + 4*x^2 - 20*x + 23 x^4 - 3*x^2 + 169 x^4 - x^3 + 4*x^2 + 38*x - 35 x^4 - x^3 - 170*x^2 + 502*x + 545 x^4 - 2*x^3 + 16*x^2 - 15*x + 223