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  1. Hume’s fork is the idea that for a belief to be justified it must be either a(n) ______________________________ or a(n) ______________________________.

  2. ____________________ and ____________________ believed that there were no substances.

  3. For Descartes, clear and distinct propositions were ____________________.

  4. Empiricism is the philosophy that demands that all knowledge, except for logical truths and principles of mathematics, comes from ____________________.

  5. Knowledge can be defined as ________________________________________.


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