 Complete the following phrase:  The Soviets would take out all of the championships during the 60s with them having a fifty-five game winning streak which would be broken by Yugoslavia in 1969. For Yugoslavia, they were starting to come to challenge the Soviets with the main player in Radivoj Korac aiding the team to two silvers and a bronze medal, in his career which stopped in 1967. The 1960s would see also a change in how the competition was viewed and run with FIBA putting a limit on the number of countries that entered to 16 with qualifiers being the way to bring them down to that number as it first appeared in 