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Descendants of Frederick Douglass on the 4th of July {{URL}} via {{USERNAME}}
 Frederick Douglass, 4th of July
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: group, creative work, person, event, product, location, corporation 
Text: {0} 
Answer:
 Frederick Douglass, 4th of July