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It would take 1 , 000 to 1 , 500 rods to make enough plutonium for a weapon , experts say . O
 experts, a weapon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 experts, a weapon