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_22 (race_name VARCHAR, dist__miles_ VARCHAR, runner_up VARCHAR)
### Question:
Which race had a distance of 4 miles where the runner-up was not known?
### Answer:
SELECT race_name FROM table_name_22 WHERE dist__miles_ = "4" AND runner_up = "not known"