user: Question: What is the total amount of grid when the laps amount was smaller than 68 and the time/retired was Injection?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['John Surtees', 'Honda', 68.0, '1:43:45.0', 9.0]
SQL:

assistant: SELECT SUM("Grid") FROM "Table" WHERE "Laps" < 68.0 AND "Time/Retired" = 'Injection';