Combining Texts

You have chosen 'Some Puzzles of Ground' by Kit Fine, 'The World as Will and Idea' by Arthur Schopenhauer and 'Presidential Address of Am. Math. Soc' by Oswald Veblen

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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