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The term " acropolis " is also used to describe the central complex of overlapping structures , such as plazas and pyramids , in many Maya cities , including Tikal and Copán .
 Tikal, Copán
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tikal, Copán