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Two similar vessels contain exactly similar volumes of two different liquids. We shall call them oil and vinegar for convenience, but please ignore such considerations as density, viscosity and miscibility. A spoonful of oil is transferred to the vinegar, which is then stirred thoroughly to produce a consistent mixture. The same spoon is used to transfer a spoonful of the mixture to the oil, which is then stirred thoroughly.
Is the oil more contaminated than the vinegar, or the vinegar more contaminated than the oil, or what?
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