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This would result in the formation of three secondary categories : the first , " Community " was an example that Kant gave of such a derivative category ; the second , " Modality " , introduced by Kant , was a term which Hegel , in developing Kant 's dialectical method , showed could also be seen as a derivative category ; and the third , " Spirit " or " Will " were terms that Hegel and Schopenhauer were developing separately for use in their own systems .
 Kant, Kant, Hegel, Kant, Hegel, Schopenhauer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kant, Kant, Hegel, Kant, Hegel, Schopenhauer