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The 1981 Air Canada Cup was Canada 's third annual national midget ' AAA ' hockey championship , which was played April 14 – 19 , 1981 at the Halifax Metro Centre in Halifax , Nova Scotia .
 organization: Canada 's; location: Halifax; 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: Canada 's, Halifax, Halifax , Nova Scotia 
Answer:
 organization: Canada 's; location: Halifax; location: Halifax , Nova Scotia