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On February 14 , 1923 Detskoselsky and Petergofsky Uyezds were abolished and merged into Gatchinsky Uyezd , with the administrative center located in Gatchina .
 location: Gatchina
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: Gatchina 
Answer:
 location: Gatchina