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During the winter , Frognerkilen was used as a venue for harness racing — from 1875 to the 1920s — as well as speed skating in the pioneer days before 1900 .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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