[ x^4 - x^3 - 6*x^2 + x + 1, \ x^4 - x^3 - 8*x^2 + 2*x + 21, \ x^4 - x^3 - 17*x^2 + 26*x + 120, \ x^4 + 61*x^2 + 1521, \ x^4 - x^3 + 589*x^2 + x + 82706, \ x^4 - x^3 - 156*x^2 - 808*x - 11139 ]