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The grandstand consists essentially of a semicircular seating area ( cavea ) , with capacity for 6,000 spectators eventually divided into three zones : the lowest tier called the ima cavea ( 22 rows ) , the medium tier called the media ( 5 rows ) and a top tier called the summa , the latter in very poor state at present .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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