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_1 (class VARCHAR, no_built VARCHAR, operator VARCHAR)
### Question:
What class has less than 12 numbers built operated by southern?
### Answer:
SELECT class FROM table_name_1 WHERE no_built < 12 AND operator = "southern"