Enneper surface

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Enneper (1864) surface is a self-intersecting surface that can be described parametrically by the equations: x = u * (1 - u^2 / 3 + v^2) / 3 y = -v * (1 - v^2 / 3 + u^2) / 3 z = (u^2 - v^2) / 3 The parameters u and v are defined in the 2D space R^2. This surface prints neatly.