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Example

$\psfig{figure=figures/f25-4.ps}$

$\vec{p_1} \times \vec{p_2} > 0$ , $\vec{p_2}$ ccw from $\vec{p_1}$

$\vec{p_1} \times \vec{p_3} < 0$ , $\vec{p_3}$ cw from $\vec{p_1}$

Therefore there is a cw relation by translating p₀ to the origin and taking the cross product.

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