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Indirect realism , the view held by John Locke and Nicolas Malebranche , proposes that we can only be aware of mental representations of objects .
 John Locke, Nicolas Malebranche
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 John Locke, Nicolas Malebranche