Combining Texts

You have chosen 'On the Ultimate Origination of Things' by Gottfried Leibniz, 'Naming and Necessity lectures' by Saul A. Kripke and 'On the Happy Life' by Seneca the Younger

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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