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shrink, stretch gives the shrinking and stretching factor of the node. The values of the
attributes width, height, borderwidth and the size of the label text is scaled by ((stretch=shrink) \Lambda 100) percent.
Note that the actual scale value is determined by the scale value of a node relatively to a scale value of the graph, i.e.
if (stretch,shrink) = (2,1) for the graph and (stretch,shrink) = (2,1) for the node of the graph, then the node is scaled
by the factor 4 compared to the normal size. The scale value can also be specified by scaling: float.
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