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Gkioulmpas qualified for the men 's 200 m backstroke at the 2004 Summer Olympics in Athens , representing the host nation Greece .
 location: Athens; location: Greece
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Athens; location: Greece