Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_74 (year_s__of_manufacture VARCHAR, quantity VARCHAR, axle_arrangement___uic__ VARCHAR)
### Question:
What year was the b n2t axle arrangement, which has a quantity of 31, manufactured?
### Answer:
SELECT year_s__of_manufacture FROM table_name_74 WHERE quantity = 31 AND axle_arrangement___uic__ = "b n2t"