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The first step is to define different named entities in document.
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The picture shows 6 entities labeled 0 1 2 3 4 5
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0 is main window
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Others subsidiary windows 1-ɱ
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4 is layered above 3 and 5
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There could be other hidden named entities -- either because they had CSS-P visibility attribute set to hidden or because they were completely underneath other named windows
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Entities could either be scattered around -- seemingly at random or aligned precisely w.r.t. other positionable parts of document
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