user: Question: What engine did Scuderia Ambrosiana with fewer than 4 points have?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1950.0, 'Alfa Romeo SpA', 'Alfa Romeo 158', 'Alfa Romeo Straight-8', 4.0]
SQL:

assistant: SELECT "Engine" FROM "Table" WHERE "Entrant" = 'Scuderia Ambrosiana' AND "Points" < 4.0;