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| Aquinas | Aristotle | Augustine | Bacon | Berkeley |
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| Burke | Descartes | Frege | Hegel | Hobbes |
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| Hume | Kant | Kierkegaard | Leibniz | Locke |
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| Marx | Mill | Nietzsche | Plato | Rand |
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| Rousseau | Russell | Sartre | Spinoza | Wittgenstein |
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With grateful acknowledgements to
