user: Question: What enGine was used durinG the race driven by Jan Lammers usinG a chassis of D3 D4, makinG a tyre of G and rounds of 4-6?
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 "Engine" FROM "Table" WHERE "Tyres" = 'G' AND "Chassis" = 'D3 D4' AND "Driver" = 'Jan Lammers' AND "Rounds" = '4-6';