Combining Texts

You have chosen 'The Nature of Things' by Anthony Quinton, 'The Ultimate Constituents of Matter' by Bertrand Russell and 'A Theory of Conditionals' by Robert C. Stalnaker

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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