user: Question: Which engine oF Rob Walker Racing Team has 47 points and F tyres?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Tyres', 'Points']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1963.0, 'Canadian Stebro Racing', 'Stebro Mk IV', '109E 1.5 L4', 'D', '0']
SQL:

assistant: SELECT "Engine" FROM "Table" WHERE "Points" = '47' AND "Tyres" = 'F' AND "Entrant" = 'Rob Walker Racing Team';