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_16581695_2 (written_by VARCHAR, no_in_series VARCHAR)
### Question:
Who was the writer of the episode number in series 4?
### Answer:
SELECT written_by FROM table_16581695_2 WHERE no_in_series = "4"