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- SELECT DISTINCT model FROM
- (SELECT model, price FROM PC
- UNION
- SELECT model, price FROM Laptop
- UNION
- SELECT model, price FROM Printer) AS tab
- WHERE price = (SELECT MAX(price) FROM
- (SELECT model, price FROM
- (SELECT model, price FROM PC
- UNION
- SELECT model, price FROM Laptop
- UNION
- SELECT model, price FROM Printer) AS tab1) AS tab2)
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