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_23851574_2 (aper_in VARCHAR, built_used VARCHAR)
### Question:
Which aperture were built or used between 1987-2001?
### Answer:
SELECT aper_in FROM table_23851574_2 WHERE built_used = "1987-2001"