[ x^4 + 55*x^2 + 144, \ x^4 - x^3 + 109*x^2 - 84*x + 2000, \ x^4 - x^3 - 143*x^2 + 990*x - 1949, \ x^4 - 2*x^3 + 199*x^2 - 198*x + 5 ]