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Toronto 's First Post Office ( or Fourth York Post Office ) is the oldest purpose-built post office in Toronto , Ontario , Canada , and the only surviving example of a post office that functioned as a department of the British Royal Mail .
 Toronto, Toronto, Ontario, Canada, British Royal Mail
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Toronto, Toronto, Ontario, Canada, British Royal Mail