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The Cohors XX Palmyrenorum ( " 20th part-mounted double-strength Cohort of the Palmyrans " ) was a Roman auxiliary , a cohors equitata milliaria , mixed infantry and cavalry regiment .
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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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