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About 3,500 naval shipyard workers marched in the centre of the northern port town of Cherbourg on Thursday to protest against defence restructuring , a union official said .
 location: Cherbourg
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, else, organization, person 
Text: {0} 
 Entities: Cherbourg 
Answer:
 location: Cherbourg