What is Circuit, when Series is ASTC Round 4?
CREATE TABLE table_name_26 (
    circuit VARCHAR,
    series VARCHAR
)
SELECT circuit FROM table_name_26 WHERE series = "astc round 4"
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 Circuit, when Series is ASTC Round 4? ### Input: CREATE TABLE table_name_26 (
    circuit VARCHAR,
    series VARCHAR
) ### Response: SELECT circuit FROM table_name_26 WHERE series = "astc round 4"