How many different writers have written the episode with series number 8?
CREATE TABLE table_23958944_2 (
    written_by VARCHAR,
    no_by_series VARCHAR
)
SELECT COUNT(written_by) FROM table_23958944_2 WHERE no_by_series = 8
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: How many different writers have written the episode with series number 8? ### Input: CREATE TABLE table_23958944_2 (
    written_by VARCHAR,
    no_by_series VARCHAR
) ### Response: SELECT COUNT(written_by) FROM table_23958944_2 WHERE no_by_series = 8