Premise: Barbro Martinsson (born 16 August 1935) is a former Swedish cross country skier who competed during the 1960s. Born in Valbo, she won two silver medals in the 3 x 5 km at the 1964 Winter Olympics and the 1968 Winter Olympics. Martinsson finished 4th in the 1968 Winter Olympics in both 5 km and 10 km.
Hypothesis: Martinsson participated in 5 different Olympics games.