 Complete the following phrase:  The ball was first introduced as the Telstar Elast for the 1968 European Football Championship. A slightly different ball named Telstar was used as the official match ball of the 1970 FIFA World Cup in Mexico. The similar Telstar Durlast was one of two official balls, along with the Chile Durlast, of the 1974 FIFA World Cup held in West Germany. The ball was also used in the 