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_83 (Id VARCHAR)
### Question:
Which 2009 has a 2006 of A, and a 2011 of sf?
### Answer:
SELECT 2009 FROM table_name_83 WHERE 2006 = "a" AND 2011 = "sf"