What type of details about adu celso can be gathered from the following bio? Bio: adu celso-santos -lrb- born eduardo celso santos , august 7 , 1945 - 6 february 2005 -rrb- was the first brazilian motorcycle road racer to compete in grand prix motorcycle racing . celso-santos was popular on the grand prix circuit during first half of the 1970s . he raced from 1972 to the 1975 season before returning to brazil . in the 1973 grand prix season , he gained his only victory in a race counting for world championship points when he won the 350cc class at the spanish grand prix held at the jarama circuit .
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