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As a reoccurring theme amid Du Bois ’ works , the Negro as a problem to those representing the majority population was a concept into which Du Bois sought to delve further as he explored what it meant to be a minority – and an educated one – among those who still viewed minorities as a nuisance to their culture or else a burden and creatures not belonging as one of their own .
 Du Bois, Du Bois
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Du Bois, Du Bois