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 "2-174491-5" WHERE "Winter Olympics" = 1968.0;

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 "2-174491-5" WHERE "FIS Nordic World Ski Championships" < 1989.0 AND "Winter Olympics" < 1980.0 AND "Holmenkollen" = '1956';