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The building was the site of the Ponce Massacre , and the museum depicts the history and events surrounding the event , which some describe as the most tragic event in the history of Puerto Rico 's struggle for independence .
 Ponce, Puerto Rico
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ponce, Puerto Rico