Q:What type of details about leo proost can be gathered from the following bio? Bio: leo proost -lrb- born 1 november 1933 -rrb- is a retired belgian cyclist . he had his best achievements in motor-paced racing , in which he won the world championships in the professionals category in 1963 , 1967 and 1968 , as well as national titles between 1963 and 1968 . during his career proost took part in 25 six-day races , winning the race of antwerp in 1963 .
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