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Tunnels of Blood is the third novel of twelve in the The Saga of Darren Shan by Darren Shan .
 Darren Shan, Darren Shan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Darren Shan, Darren Shan