Combining Texts

You have chosen 'Unconscious Cerebral Initiative' by Benjamin Libet, 'New Foundations for Mathematical Logic' by Willard Quine and 'Elucidation of some points in E.Schrder' by Gottlob Frege

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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