What is the title of the episode written by Vanessa Bates? 
CREATE TABLE table_19517621_4 (title VARCHAR, written_by VARCHAR)
SELECT title FROM table_19517621_4 WHERE written_by = "Vanessa Bates"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_19517621_4 (title VARCHAR, written_by VARCHAR) Question: What is the title of the episode written by Vanessa Bates?  [/INST] SELECT title FROM table_19517621_4 WHERE written_by = "Vanessa Bates" </s>