Who were the writers of episode 20?
CREATE TABLE table_20538157_2 (written_by VARCHAR, no_in_season VARCHAR)
SELECT written_by FROM table_20538157_2 WHERE no_in_season = 20
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_20538157_2 (written_by VARCHAR, no_in_season VARCHAR) Question: Who were the writers of episode 20? [/INST] SELECT written_by FROM table_20538157_2 WHERE no_in_season = 20 </s>