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_2 (date VARCHAR, edition VARCHAR, opponent VARCHAR)
### Question:
When was the 1991 world group I with the opponent of Li Fang?
### Answer:
SELECT date FROM table_name_2 WHERE edition = "1991 world group i" AND opponent = "li fang"