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

### Instruction:
What kind of  Manufacturer has a Laps smaller than 20 and a Grid of 21

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

### Response:
SELECT Manufacturer FROM table WHERE Laps < 20 AND Grid = 21