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

### Instruction:
Which Year(s) of manufacture has a Quantity of 2, and a Type of b n2t?

### Inputs:
table_name: table, columns: ['Class', 'Railway number(s)', 'Quantity', 'Year(s) of manufacture', 'Type']

### Response:
SELECT Year(s) of manufacture FROM table WHERE Quantity = 2 AND Type = b n2t