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The measure gives the probability of the system X being in state x ( equivalently , of the random variable X having value x ) as Here , E ( x ) is a function from the space of states to the real numbers ; in physics applications , E ( x ) is interpreted as the energy of the configuration x. The parameter \ beta is a free parameter ; in physics , it is the inverse temperature .
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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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