user: Question: In rounds 7-13 what engine was featured?
Columns: ['Constructor', 'Chassis', 'Engine', 'Tyre', 'Driver', 'Rounds']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Tyrrell - Ford', '001', 'Ford Cosworth DFV 3.0 V8', 'D', 'Jackie Stewart', '11-13']
SQL:

assistant: SELECT "Engine" FROM "Table" WHERE "Rounds" = '7-13';