Combining Texts

You have chosen 'Intro to 'Questions of Time and Tense'' by Robin Le Poidevin, 'On the Law of War and Peace' by Hugo Grotius and 'The Establishment of Scientific Semantics' by Alfred Tarski

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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