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Ronald Wallace , ( c. 1916 – May 20 , 2008 ) was an optometrist and the longest-serving mayor of the city of Halifax , Nova Scotia .
 person: Ronald Wallace; location: Halifax , Nova Scotia
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: Ronald Wallace, Halifax , Nova Scotia 
Answer:
 person: Ronald Wallace; location: Halifax , Nova Scotia