Combining Texts

You have chosen 'Presidential Address of Am. Math. Soc' by Oswald Veblen, 'Maxims and Reflections' by Wolfgang von Goethe and 'Time and Free Will' by Henri Bergson

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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