6xz+xz−x3y26 x z+x z-x^{3} y^{2}6xz+xz−x3y2
6xz+xz2−x3y26 x z+x z^{2}-x^{3} y^{2}6xz+xz2−x3y2
6xz+x2z−x3y26 x z+x^{2} z-x^{3} y^{2}6xz+x2z−x3y2
6xz+x2z2−x3y36 x z+x^{2} z^{2}-x^{3} y^{3}6xz+x2z2−x3y3