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In 1938 he sold a short story , The Warning to Collier 's and in 1941 he sold his novel Blood on the Moon aka Gunman 's Chance to The Saturday Evening Post .
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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:
 None