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obviously , we continue to see signs of moderation , but let ' s remember this is still the longest and strongest boom in all of american history .
 american, we, s
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 american, we, s