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_27734577_13 (series VARCHAR, high_rebounds VARCHAR)
### Question:
What is the series number when al horford (10) had the high rebounds?
### Answer:
SELECT series FROM table_27734577_13 WHERE high_rebounds = "Al Horford (10)"