 Complete the following phrase:  A factoring system is used in the sport to allow different classes to compete against each other when there are too few individual competitors in one class in a competition. The factoring for LW4 alpine skiing classification during the 20112012 skiing season was 0.9961 for slalom, 0.995 for giant slalom, 0.9901 for Super-G and 0.9949 for downhill. In para-Nordic skiing, the percentage for the 20122013 ski season was 96 for classic and 96 for free. While LW4 was not grouped with others classes at an event in the 1980s, it became grouped with other classifications during the 1990s and 2000s. Eligible events for this classification included 1986 World Disabled Ski Championships, 1988 World Winter Games for the Disabled, 1990 Disabled Alpine World Championships, 1992 Winter Paralympics, 1994 Winter Paralympics, 1996 Disabled Alpine World Championships in Lech, Austria, 