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_21 (liberal_ticket VARCHAR, free_libertarian_ticket VARCHAR)
### Question:
The Liberal Ticket listed which candidate when Jack A. Martin was listed on the Free Libertarian Ticket?
### Answer:
SELECT liberal_ticket FROM table_name_21 WHERE free_libertarian_ticket = "jack a. martin"