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_16028459_2 (bills_first_downs INTEGER, opponents VARCHAR)
### Question:
How many first downs did the bills have when their opponent had 6
### Answer:
SELECT MIN(bills_first_downs) FROM table_16028459_2 WHERE opponents = 6