Combining Texts

You have chosen 'A Realistic Theory of Categories' by Roderick Chisholm, 'Rules for the Direction of the Mind' by Ren Descartes and 'On the Freedom of the Will' by Arthur Schopenhauer

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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