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 (employed VARCHAR, position_held VARCHAR)
### Question:
What are the years employed shown for mathematics & prefect master?
### Answer:
SELECT employed FROM table_name_74 WHERE position_held = "mathematics & prefect master"