SigmaYY Command

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SigmaYY[ <List of Points> ]
Calculates the sum of squares of y-coordinates of the given points.
Example: Let list = { (-3, 4), (-1, 4), (-2, 3), (1, 3), (2, 2), (1, 5) } be a list of points. SigmaYY[ list ] yields a = 79.
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