 Complete the following phrase:  The Basketball World Cup has existed in several different formats throughout the years, as it has expanded and contracted between 10 and 24 teams. The first tournament, in 1950, began with a ten-team double-elimination tournament, followed by a six-team round robin round to determine the champion. Between 1954 and 1974, each tournament started with a group stage preliminary round; the top teams in each preliminary round group then moved on to a final round robin group to determine the champion. In 1978, FIBA added a gold medal game between the top two finishers in the final group and a bronze medal game between the third and fourth place teams. In each year between 1959 and 1982, the host team received a bye into the final group. Of the seven host teams in this era, only three won medals, despite the head start. As a result, FIBA made the host team compete in the preliminary round starting in 