[x^6+3*x^4+4*x^3+9*x^2-3*x+7, \
x^6-6*x^4-7*x^3+9*x^2+21*x-2, \
x^6-3*x^5-3*x^4+14*x^3-12*x+9, \
x^6-3*x^4-3*x^3+21*x^2+27*x-16]