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Tregubova made her official debut , as Moldova 's youngest swimmer ( aged 16 ) , at the 2000 Summer Olympics in Sydney , where she competed in the women 's 50 m freestyle .
 Sydney
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