 Complete the following phrase:  From 1948 through 1980, the alpine skiing events at the Winter Olympics also served as the World Championships, held every two years. With the addition of the giant slalom, the combined event was dropped for 1950 and 1952, but returned as a World Championship event in 1954 as a paper race which used the results from the three events. During the Olympics from 1956 through 1980, World Championship medals were awarded by the FIS for the combined event. The combined returned as a separate event at the World Championships in 