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_31 (unit VARCHAR, type VARCHAR)
### Question:
Which unite had the type wwer-440/213?
### Answer:
SELECT unit FROM table_name_31 WHERE type = "wwer-440/213"