Combining Texts

You have chosen 'Introduction to Mathematical Logic' by Michal Walicki, 'Causation and the Manifestation of Powers' by Alexander Bird and 'What is an Idea?' by Gottfried Leibniz

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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