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A simple type to represent a pair of objects.
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A simple type to represent a pair of objects.
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A simple type to represent a pair of objects.
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A simple type to represent a pair of objects.
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A simple type to represent a pair of objects.
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A simple type to represent a pair of objects.
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A simple type to represent a pair of objects.
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A simple type to represent a pair of objects.
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A simple type to represent a pair of objects.