user: Question: Which Year(s) of manufacture has a Type of 1B n2, and a Quantity of 10?
Columns: ['Class', 'Railway number(s)', 'Quantity', 'Year(s) of manufacture', 'Type']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['B/B2 to 1869: D', '180–183, 208–251, 270–295, 306–317', 86.0, '1868–1878', '1B n2']
SQL:

assistant: SELECT "Year(s) of manufacture" FROM "Table" WHERE "Type" = '1B n2' AND "Quantity" = 10.0;