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More realistic models are tailored to a specific problem and include the transition state theory , the calculation of the potential energy surface , the Marcus theory and the Rice–Ramsperger–Kassel–Marcus ( RRKM ) theory .
 Marcus, Rice–Ramsperger–Kassel–Marcus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Marcus, Rice–Ramsperger–Kassel–Marcus