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 book (Title VARCHAR, Book_ID VARCHAR); CREATE TABLE publication (Title VARCHAR, Book_ID VARCHAR)
### Question:
List the titles of books that are not published.
### Answer:
SELECT Title FROM book WHERE NOT Book_ID IN (SELECT Book_ID FROM publication)