Combining Texts

You have chosen 'Natural Kinds' by Willard Quine, 'Rules for the Direction of the Mind' by Ren Descartes and 'Whitehead and the Rise of Modern Logic' by Willard Quine

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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