Combining Texts

You have chosen 'Reply to 'Rorarius' 2nd ed' by Gottfried Leibniz, 'The Semantic Conception of Truth' by Alfred Tarski and 'Empiricism, Semantics and Ontology' by Rudolph Carnap

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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