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_36 (secr_numbers VARCHAR, class VARCHAR)
### Question:
Which SECR numbers have a class of b1?
### Answer:
SELECT secr_numbers FROM table_name_36 WHERE class = "b1"