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

### Instruction:
What is the highest play-offs that have stevenage borough as the club, and a total greater than 21?

### Inputs:
table_name: table, columns: ['Player', 'Club', 'League', 'Play-offs', 'FA Cup', 'FA Trophy', 'Total']

### Response:
SELECT MAX Play-offs FROM table WHERE Club = stevenage borough AND Total > 21