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_21761882_4 (location VARCHAR, opponent VARCHAR)
### Question:
What was the location for when the opponent was @ roughriders?
### Answer:
SELECT location FROM table_21761882_4 WHERE opponent = "@ Roughriders"