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In early modern philosophy , conceptualist anti-realist doctrines about universals were proposed by thinkers like René Descartes , John Locke , Baruch Spinoza , Gottfried Wilhelm Leibniz , George Berkeley , and David Hume .
 person: René Descartes; person: John Locke; person: Baruch Spinoza; person: Gottfried Wilhelm Leibniz; person: George Berkeley; person: David Hume
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: René Descartes; person: John Locke; person: Baruch Spinoza; person: Gottfried Wilhelm Leibniz; person: George Berkeley; person: David Hume