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_27396005_2 (constructor VARCHAR, grid VARCHAR)
### Question:
How many constructors had a grid of 13?
### Answer:
SELECT COUNT(constructor) FROM table_27396005_2 WHERE grid = 13