Combining Texts

You have chosen 'Rationality' by Gilbert Harman, 'New Proof of Possibility of Well-Ordering' by Ernst Zermelo and 'Reply to Professor Frankena' by Philippa Foot

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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