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At peak times it has 24 advanced life support ambulances available , most staffed by two paramedic s. Denver Paramedics respond to an average of 80,000 calls for service a year , an average of 219 calls a day .
 Denver
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Denver