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Much of the BDSM culture can be traced back to the gay male leather culture , which formalized itself out of the group of men who were soldiers returning home after World War II ( 1939 – 1945 ) .
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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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