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_25595107_2 (sail_number VARCHAR, loa__metres_ VARCHAR)
### Question:
What is the number of the sail with an overall length of 13.68?
### Answer:
SELECT sail_number FROM table_25595107_2 WHERE loa__metres_ = "13.68"