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Middle April the Chileans started the Ambrosio Letelier Expedition to defeat the last forces of Pierola , but after many losts the expedition came back to Lima in early July , where Letelier and his officers were court martialed .
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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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