CenterFigure:

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   Find a position array that centers a figure
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   Form:
   position = CenterFigure( width, height )
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   Inputs
   ------
   width         (1,1)   Figure width
   height        (1,1)   Figure height

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   Outputs
   -------
   position      (1,4)   [left bottom width height]     

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Children: