Combining Texts

You have chosen 'Does Emp.Knowledge have Foundation?' by Wilfrid Sellars, 'Explaining Explanation' by David-Hillel Ruben and 'Leibniz: Guide for the Perplexed' by Franklin Perkins

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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