[MSDN Library April 2000] CombineRgn (100%)

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[MSDN Library April 2000] CombineRgn (52.6442307692308%)

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[MSDN Library September 1992] CombineRgn (48.6781609195402%)

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[MSDN Library September 1992] CombineRgn (41.7464114832536%)

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[MSDN Library September 1992] CombineRgn (31.6964285714286%)

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