What is the total amount of grid when the laps amount was smaller than 68 and the time/retired was injection?
CREATE TABLE table_54426 (
    "Driver" text,
    "Constructor" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
)
SELECT SUM("Grid") FROM table_54426 WHERE "Laps" < '68' AND "Time/Retired" = 'injection'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the total amount of grid when the laps amount was smaller than 68 and the time/retired was injection? ### Input: CREATE TABLE table_54426 (
    "Driver" text,
    "Constructor" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
) ### Response: SELECT SUM("Grid") FROM table_54426 WHERE "Laps" < '68' AND "Time/Retired" = 'injection'