Combining Texts

You have chosen 'Aristotle and Descartes on Matter' by Gottfried Leibniz, 'Reply to 'Rorarius' 2nd ed' by Gottfried Leibniz and 'Summula philosophiae naturalis' by William of Ockham

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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