Imagine you have two large pitchers. One contains a gallon of water and the other a gallon of wine. One pint of wine is removed from the wine pitcher, poured into the water pitcher and mixed thoroughly. Then a pint of the mixture from the water pitcher is removed and poured into the wine pitcher.
Is there now more or less water in the wine pitcher than there is wine in the water pitcher?
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There is exactly as much water in the wine pitcher as there is wine in the water pitcher.