Combining Texts

You have chosen 'Wittgenstein on Rules and Private Language' by Saul A. Kripke, 'Sententia on 'De Caelo'' by Thomas Aquinas and 'On the Concept of Number' by David Hilbert

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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