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

### Instruction:
What model has a number built smaller than 6.526, and the Chassis code w109.015?

### Inputs:
table_name: table, columns: ['Model', 'Chassis code', 'Production time', 'Number built', 'Engine']

### Response:
SELECT Model FROM table WHERE Number built < 6.526 AND Chassis code = w109.015