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Essential David Niall Wilson series The following titles were announced for the Essential David Niall Wilson series : Essential Ronald Kelly series The following titles have been announced for the Essential Ronald Kelly series .
 Niall Wilson, David Niall Wilson, Ronald Kelly, Ronald Kelly
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Niall Wilson, David Niall Wilson, Ronald Kelly, Ronald Kelly