Combining Texts

You have chosen 'A Puzzle about Belief' by Saul A. Kripke, 'Vagueness, Truth and Logic' by Kit Fine and 'Letters to Burcher De Volder' 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