Combining Texts

You have chosen 'On the Principles of Indiscernibles' by Gottfried Leibniz, 'A General Principle to Explain Laws of Nature' by Gottfried Leibniz and 'Process and Reality' by Alfred North Whitehead

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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