 Complete the following phrase:  Antonina Alexandrovna Seredina ; 23 December 1929  2 September 2016 was a Russian sprint canoeist. She won the 500 m singles and doubles events at the 1960 Olympics, and placed third in the doubles in 1968 and fourth in 1964. She also won five medals at the ICF Canoe Sprint World Championships with two golds K-4 500 m: 1963, 1966 and three silvers K-1 500 m: 1958, K-2 500 m: 