How big (in km2) is the voivodenship also known by the abbreviation KN?
CREATE TABLE table_11656578_2 (area_km²__1998_ VARCHAR, abbreviation VARCHAR)
SELECT area_km²__1998_ FROM table_11656578_2 WHERE abbreviation = "kn"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_11656578_2 (area_km²__1998_ VARCHAR, abbreviation VARCHAR) Question: How big (in km2) is the voivodenship also known by the abbreviation KN? [/INST] SELECT area_km²__1998_ FROM table_11656578_2 WHERE abbreviation = "kn" </s>