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_68 (engine_s_ VARCHAR, tyres VARCHAR, year VARCHAR)
### Question:
What is the Engine(s) that has  f Tyres in 1971?
### Answer:
SELECT engine_s_ FROM table_name_68 WHERE tyres = "f" AND year = 1971