What was the location for when the opponent was @ roughriders?
CREATE TABLE table_21761882_4 (
    location VARCHAR,
    opponent VARCHAR
)
SELECT location FROM table_21761882_4 WHERE opponent = "@ Roughriders"
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 was the location for when the opponent was @ roughriders? ### Input: CREATE TABLE table_21761882_4 (
    location VARCHAR,
    opponent VARCHAR
) ### Response: SELECT location FROM table_21761882_4 WHERE opponent = "@ Roughriders"