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_51 (Id VARCHAR)
### Question:
What's the 1986 if 1991 has a QF and 1998 has a 3R?
### Answer:
SELECT 1986 FROM table_name_51 WHERE 1991 = "qf" AND 1998 = "3r"