What number episode was Week 4, Part 1? 
CREATE TABLE table_25391981_20 (episode_number VARCHAR, episode VARCHAR)
SELECT episode_number FROM table_25391981_20 WHERE episode = "Week 4, Part 1"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_25391981_20 (episode_number VARCHAR, episode VARCHAR) Question: What number episode was Week 4, Part 1?  [/INST] SELECT episode_number FROM table_25391981_20 WHERE episode = "Week 4, Part 1" </s>