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_68 (replaced_by VARCHAR, date_of_vacancy VARCHAR)
### Question:
What is Replaced By, when Date of Vacancy is "23 February 2009"?
### Answer:
SELECT replaced_by FROM table_name_68 WHERE date_of_vacancy = "23 february 2009"