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A biologist, a physicist and a mathematician are having lunch at an outdoor café. Across the street, they see two people entering a building. A little while later they see three people exiting the building.
The biologist says, "They must have reproduced."
The physicist says, "There must have been some experimental error."
After a few minutes of thought, the mathematician remarks, "You know, if one more person walks into that building, it'll be empty."
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