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His volume of essays , " Bards and Tyrants : Essays in Contemporary African Writing " , evaluates some aspects and visions of African writing and criticism in the works of Achebe , Ngugi , Soyinka , Nwoga , Chinweizu , Emenyonu , Nnolim and other new poetry , prose and critical voices from around the continent .
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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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