Combining Texts

You have chosen 'Principles of Nature and Grace based on Reason' by Gottfried Leibniz, 'The Fragmentation of Value' by Thomas Nagel and 'The Actual and the Possible' by Alexander R. Pruss

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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