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Some of the most famous forms of idealism include transcendental idealism ( developed by Immanuel Kant ) , subjective idealism ( developed by George Berkeley ) , and absolute idealism ( developed by Georg Wilhelm Friedrich Hegel and Friedrich Schelling ) .
 Immanuel Kant, George Berkeley, Georg Wilhelm Friedrich Hegel, Friedrich Schelling
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Immanuel Kant, George Berkeley, Georg Wilhelm Friedrich Hegel, Friedrich Schelling