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On February 14 , 1923 Gatchina was renamed Trotsk , and Gatchinsky Uyezd was renamed Trotsky Uyezd , after Leon Trotsky .
 Gatchina, Trotsky, Leon Trotsky
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gatchina, Trotsky, Leon Trotsky