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_23958944_2 (written_by VARCHAR, no_by_series VARCHAR)
### Question:
How many different writers have written the episode with series number 8?
### Answer:
SELECT COUNT(written_by) FROM table_23958944_2 WHERE no_by_series = 8