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Gibbs measure implies the Markov property ( a certain kind of statistical independence ) ; and importantly , it implies the Hammersley – Clifford theorem that the energy function can be written as a multiplication of parts , thus leading to its widespread appearance in many problems outside of physics , such as Hopfield network s , Markov network s , and Markov logic network s. In addition , the Gibbs measure is the unique measure that maximizes the entropy for a given expected energy ; thus , the Gibbs measure underlies maximum entropy method s and the algorithms derived therefrom .
 Gibbs, Gibbs, Gibbs
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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 Gibbs, Gibbs, Gibbs