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It was his metaphysical works , however , that had the most lasting influence , being considered primary sources for utilitarianism by philosophers such as Jeremy Bentham , John Stuart Mill , and Herbert Spencer .
 person: Jeremy Bentham; person: John Stuart Mill; person: Herbert Spencer
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: Jeremy Bentham; person: John Stuart Mill; person: Herbert Spencer