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

### Instruction:
If the manufacturer is Yamaha, and the laps driven were under 32, what's the average of all grid sizes with that criteria?

### Inputs:
table_name: table, columns: ['Rider', 'Manufacturer', 'Laps', 'Time', 'Grid']

### Response:
SELECT AVG Grid FROM table WHERE Laps < 32 AND Manufacturer = yamaha