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Waldyr Pereira, also known as Didi, was a Brazilian footballer who played as a midfielder or as a forward. He played in three FIFA World Cups, winning the latter two. An elegant and technical player, Didi was renowned for his range of passing, stamina and technique. He also was a free-kick specialist, being famous for inventing the folha seca dead ball free kicks, notably used by modern-day players such as Juninho and Cristiano Ronaldo, where the ball would swerve downward unexpectedly at a point resulting in a goal. During his career, he was part of Fluminense between the end of the 1940s to the mid-1950s and one of the main players of the iconic squad of Botafogo in the early 1960s with other world champions such as Garrincha, Nilton Santos, Zagallo and Amarildo.