Combining Texts

You have chosen 'works' by Luitzen E.J. Brouwer, 'Aristotle on Friendship' by John M. Cooper and 'Lectures 1930-32 (student notes)' by Ludwig Wittgenstein

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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