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