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Proposed solutions can be divided broadly into two categories : dualist solutions that maintain Descartes ' rigid distinction between the realm of consciousness and the realm of matter but give different answers for how the two realms relate to each other ; and monist solutions that maintain that there is really only one realm of being , of which consciousness and matter are both aspects .
 Descartes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Descartes