Table: nordic_skiing_winners_5
Columns: winner
country
winter_olympics
fis_nordic_world_ski_championships
holmenkollen

Question: What is the FIS Nordic World Ski Championship years when the winter Olympics took place in 1968?
SQL: SELECT "fis_nordic_world_ski_championships" FROM nordic_skiing_winners_5 WHERE "winter_olympics" = 1968

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 nordic_skiing_winners_5 WHERE "fis_nordic_world_ski_championships" < 1989 AND "winter_olympics" < 1980 AND "holmenkollen" = '1956'