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_23 (number INTEGER, player VARCHAR, yards VARCHAR)
### Question:
What is Larry Centers' average number when there were less than 600 yards?
### Answer:
SELECT AVG(number) FROM table_name_23 WHERE player = "larry centers" AND yards < 600