If S and S' are the foci of the ellipse $\frac{{{x^2}}}{{18}} + \frac{{{y^2}}}{9} = 1$ and P be a point on the ellipse, then $\min \left( {SP \cdot {S^\prime }P} \right) + \max \left( {SP \cdot {S^\prime }P} \right)$ is equal to :
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