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Composition and formation The heat causing the melting of a reactor may originate from the nuclear chain reaction , but more commonly decay heat of the fission products contained in the fuel rods is the primary heat-source .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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