Combining Texts

You have chosen 'What Price Bivalence?' by Willard Quine, 'Letters to Descartes' by Elizabeth, Princess of Bohemia and 'The Foundations of Mathematics (2nd ed)' by Kenneth Kunen

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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