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DuPont had deviated from the Metallurgical Laboratory 's original design in which the reactor had 1,500 tubes arranged in a circle , and had added 504 tubes to fill in the corners .
 DuPont, Metallurgical Laboratory
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 DuPont, Metallurgical Laboratory