5752
While the sport has its origins in the banked-track roller-skating marathons of the 1930 s , Leo Seltzer and Damon Runyon are credited with evolving the sport to its competitive form .
 person: Leo Seltzer; person: Damon Runyon
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Leo Seltzer; person: Damon Runyon