An astronomer, a physicist and a mathematician are on a train in Scotland.
The astronomer looks out of the window, sees a black sheep standing in a field, and remarks, "How odd. Scottish sheep are black."
"No, no, no!" says the physicist. "Only some Scottish sheep are black."
The mathematician rolls his eyes at his companions' muddled thinking and says, "In Scotland, there is at least one sheep, at least one side of which is black."
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