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

### Instruction:
What is Larry Centers' average number when there were less than 600 yards?

### Inputs:
table_name: table, columns: ['Player', 'Number', 'Yards', 'Average', 'Long', 'Touchdowns']

### Response:
SELECT AVG Number FROM table WHERE Player = larry centers AND Yards < 600