(-1+4*y)*z^2*(-1+4*z)*(1+4*z)*Dz^2+y*z*(3-20*y-4*z-16*z^2+64*y*z^2)*Dz*Dy-2*y^2*(-1+16*y)*Dy^2+z*(1-12*y-32*y*z-48*z^2+192*y*z^2)*Dz+2*y*(1-32*y-2*z-24*y*z-8*z^2+32*y*z^2)*Dy+8*(-y-4*y*z-2*z^2+8*y*z^2)