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In physics , " free energy " most often refers to the Helmholtz free energy , denoted by " A " ( or " F " ) , while in chemistry , " free energy " most often refers to the Gibbs free energy .
 person: Helmholtz; person: Gibbs
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Helmholtz; person: Gibbs