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 table_name_15 (school VARCHAR, year_joined VARCHAR, year_left VARCHAR)
### Question:
Which school joined in 1971 and left in 1975?
### Answer:
SELECT school FROM table_name_15 WHERE year_joined = "1971" AND year_left = "1975"