Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which race had a distance of 4 miles where the runner-up was not known?

### Inputs:
table_name: table, columns: ['Race name', 'Dist (miles)', 'Course', 'Prize', 'Odds', 'Runners', 'Place', 'Runner-up']

### Response:
SELECT Race name FROM table WHERE Dist (miles) = 4 AND Runner-up = not known