[x^4+x^3+x^2-4*x-4, \
x^4+x^3-2*x-1, \
x^4+3*x^2+16, \
x^4-x^3-14*x^2+14*x+31, \
x^4-x^3+x^2+x+1, \
x^4+2*x^3+4*x^2+3*x+16]