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The complex was located in Peñalolén , in the outskirts of Santiago , and was in operation from mid-1974 to mid-1978 .
 Peñalolén, Santiago
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Peñalolén, Santiago