222488
The similarities to the song include that the reactor location was a deep canyon and the reactor operators were themselves 49 ' ers as 49 ( last digits of element 94 , isotope 239 ) was one of the code names for plutonium at the time .
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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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