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On August 21 , 1870 the San Ramon Prison and Penal Farm was established in Zamboanga City for Muslim and political prisoners opposed to the rule of Spain .
 Zamboanga City, Spain
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Zamboanga City, Spain