user: Question: What is the average lap total for grids under 19 and a Time/Retired of +4 laps?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Ralf Schumacher', 'Williams - BMW', 70.0, '1:30:49.213', 1.0]
SQL:

assistant: SELECT AVG("Laps") FROM "Table" WHERE "Time/Retired" = '+4 laps' AND "Grid" < 19.0;