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_79 (date VARCHAR, week VARCHAR, opponent VARCHAR)
### Question:
On what date did the Bills play the Houston Oilers before week 12?
### Answer:
SELECT date FROM table_name_79 WHERE week < 12 AND opponent = "houston oilers"