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When a serious oil leak was discovered later that night , the submarine left the patrol area two days ahead of schedule and returned to Pearl Harbor on 31 January for a major overhaul .
 location: Pearl Harbor
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: Pearl Harbor 
Answer:
 location: Pearl Harbor