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The " Sydney Trains M sets , " also referred to as the " Millennium trains " are a class of electric multiple unit operated by Sydney Trains in Sydney , New South Wales , Australia .
 Sydney Trains, Sydney Trains, Sydney, New South Wales, Australia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sydney Trains, Sydney Trains, Sydney, New South Wales, Australia