"For a grid of cells, first, the vertical and horizontal BoundSprings are computed separately. The vertical
BoundSpring is determined by stacking vertically the BoundSprings of each of the rows, and the horizontal BoundSpring is determined by stacking horizontally the BoundSprings of each of the columns. (Of course, the BoundSpring for each row or column is determined as described in the paragraph above.) The vertical and horizontal BoundSpings are finally combined to compute the BoundSpring of the grid."
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What is BoundSpring?