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_52 (class VARCHAR, number VARCHAR, built VARCHAR)
### Question:
Which class had a number under 4 and was built in 1988?
### Answer:
SELECT class FROM table_name_52 WHERE number < 4 AND built = "1988"