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In English , since around 1600 , the word " palladium " has been used figuratively to mean anything believed to provide protection or safety , and in particular in Christian contexts a sacred relic or icon believed to have a protective role in military contexts for a whole city , people or nation .
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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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