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

### Instruction:
What was the format for the 4 disc season that had less than 22 episodes and n/a for region 4?

### Inputs:
table_name: table, columns: ['DVD Season', 'Format', '# Episodes', '# Disc(s)', 'Region 4']

### Response:
SELECT Format FROM table WHERE # Episodes < 22 AND # Disc(s) = 4 AND Region 4 = n/a