y*z^2*(-1+8*y+32*y*z)*Dz^2*Dy+y^2*z*(-3+24*y+4*z+32*y*z)*Dz*Dy^2+2*y^3*(-1+16*y)*Dy^3+8*y*z^2*(1+4*z)*Dz^2+4*y*z*(-1+16*y+z+40*y*z)*Dz*Dy+2*y^2*(-3+80*y+2*z+16*y*z)*Dy^2+16*y*z*(1+6*z)*Dz+2*y*(-1+68*y+2*z+48*y*z)*Dy+8*y*(1+4*z)