Combining Texts

You have chosen 'On the Principles of Indiscernibles' by Gottfried Leibniz, 'Remarks on axiomatised set theory' by Thoralf Skolem and 'Interview with Baggini and Stangroom' by Robin Le Poidevin

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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