 Complete the following phrase:  Marg also won thirteen medals at the ICF Canoe Sprint World Championships with six golds K-4 500 m: 1978, 1979, 1983; K-4 1000 m: 1978, 1979, 1981, five silvers K-2 500 m: 1975, K-4 500 m: 1982, K-4 1000 m: 1975, 1982, 1983, and two bronzes K-4 500 m: 1981, K-4 1000 m: 