On what type of surface did they play on 13 February 1994?
CREATE TABLE table_name_80 (surface VARCHAR, date VARCHAR)
SELECT surface FROM table_name_80 WHERE date = "13 february 1994"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_80 (surface VARCHAR, date VARCHAR) Question: On what type of surface did they play on 13 February 1994? [/INST] SELECT surface FROM table_name_80 WHERE date = "13 february 1994" </s>