What episode  number of the series aired on February 26, 1968?
CREATE TABLE table_25800134_12 (series__number VARCHAR, airdate VARCHAR)
SELECT series__number FROM table_25800134_12 WHERE airdate = "February 26, 1968"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_25800134_12 (series__number VARCHAR, airdate VARCHAR) Question: What episode  number of the series aired on February 26, 1968? [/INST] SELECT series__number FROM table_25800134_12 WHERE airdate = "February 26, 1968" </s>