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Represents a rectangular area in two-dimensional space. When first
created the object defaults to an empty rectangle "0 0 0 0".
ABCpdf uses the standard Adobe PDF coordinate space. The origin
of this space is at the bottom left of the document. Distances are
measured up and right in points. Points are a traditional measure
for print work and there are 72 points in an inch. For further details
see the Coordinates
section of the documentation.
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