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 Courses (author_id VARCHAR); CREATE TABLE Course_Authors_and_Tutors (address_line_1 VARCHAR, author_id VARCHAR)
### Question:
Find the addresses and author IDs of the course authors that teach at least two courses.
### Answer:
SELECT T1.address_line_1, T2.author_id FROM Course_Authors_and_Tutors AS T1 JOIN Courses AS T2 ON T1.author_id = T2.author_id GROUP BY T2.author_id HAVING COUNT(*) >= 2