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Subjective idealists like George Berkeley are anti-realists in terms of a mind-independent world , whereas transcendental idealists like Immanuel Kant are strong skeptics of such a world , affirming epistemological and not metaphysical idealism .
 George Berkeley, Immanuel Kant
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 George Berkeley, Immanuel Kant