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 course_arrange (Name VARCHAR, Teacher_id VARCHAR); CREATE TABLE teacher (Name VARCHAR, Teacher_id VARCHAR)
### Question:
List the names of teachers who have not been arranged to teach courses.
### Answer:
SELECT Name FROM teacher WHERE NOT Teacher_id IN (SELECT Teacher_id FROM course_arrange)