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In a certain apartment complex, everyone of the 30 residents owns a dog, cat, or bird. 20 residents own a dog, 15 residents own a

In a certain apartment complex, everyone of the 30 residents owns a dog, cat, or bird. 20 residents own a dog, 15 residents own a cat, and 8 own a bird. In addition, 8 residents own both a dog and cat, 4 own both a dog and bird, and 3 own both a cat and bird. How many residents own all three animals?

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