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His next step was the National titles and he duly won both the events in the National Games , retaining his hold on the events from 1963 to 1973 .
 None
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:
 None