Combining Texts

You have chosen 'Four Decades of Scientific Explanation' by Wesley Salmon, 'Rules for the Direction of the Mind' by Ren Descartes and 'Causation and Laws of Nature' by Jonathan Schaffer

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All the ideas for Existence, or select a subheading:
      A. Nature of Existence
      B. Change in Existence
      C. Structure of Existence
      D. Theories of Reality
      E. Categories