Table schema:
CREATE TABLE table_name_26 (country VARCHAR, holmenkollen VARCHAR, fis_nordic_world_ski_championships VARCHAR, winter_olympics VARCHAR)

Question: Which country has a FIS Nordic World Ski Championship before 1989, was in the winter Olympics before 1980, and has a Holmenkollen of 1956?
SQL: SELECT country FROM table_name_26 WHERE fis_nordic_world_ski_championships < 1989 AND winter_olympics < 1980 AND holmenkollen = "1956"