Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_48 (grid INTEGER, rider VARCHAR, laps VARCHAR)
### Question:
What is the grid number for troy corser with under 22 laps?
### Answer:
SELECT SUM(grid) FROM table_name_48 WHERE rider = "troy corser" AND laps < 22