user: Question: Who was the constructor of the car that Jan Lammers made 7-14 rounds in?
Columns: ['Constructor', 'Chassis', 'Engine', 'Tyres', 'Driver', 'Rounds']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Ferrari', '312T5', 'Ferrari 015 3.0 F12', 'M', 'Jody Scheckter', 'All']
SQL:

assistant: SELECT "Constructor" FROM "Table" WHERE "Driver" = 'Jan Lammers' AND "Rounds" = '7-14';