Combining Texts

You have chosen 'The Dappled World' by Nancy Cartwright, 'A General Principle to Explain Laws of Nature' by Gottfried Leibniz and 'The Reality of Numbers' by John Bigelow

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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