What type of details about rainer jacob can be gathered from the following bio? Bio: rainer jacob -lrb- born 15 september 1946 -rrb- is a retired german swimmer who won a silver medal in the 4 100 m freestyle relay at the 1970 european aquatics championships . he finished sixth in the same event at the 1972 summer olympics . his mother , gisela jacob-arendt , and uncle , heinz arendt , were german olympic swimmers .
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