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What are referential integrity constraints? Give an example.
Tea
A beverage made by steeping dried leaves of the tea plant (Camellia sinensis) in hot water, known for its cultural and historical significance across the world.
Opium
A narcotic obtained from the poppy plant, historically used for its analgesic and euphoric properties, and central to several historic conflicts such as the Opium Wars.
Mexican Southwest
Refers to the region of the United States that was formerly part of Mexico, including states such as California, Arizona, New Mexico, and Texas.
Catholic Church
The largest Christian church, led by the Pope, with a global presence and centuries of religious, social, and political influence.
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