[ x^4 - 47*x^2 + 729, \ x^4 - x^3 + 13*x^2 - 19*x + 361, \ x^4 - x^3 - 189*x^2 + 183*x + 6623, \ x^4 - x^3 - 88*x^2 - 928*x + 1472 ]