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Helmets using ivory from boar 's tusk s were known in the Mycenaean world from the 17th century BC ( Shaft Graves , Mycenae ) to the 10th century BC ( Elateia , Central Greece ) .
 Elateia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Elateia