Combining Texts

You have chosen 'Set Theory' by Kenneth Kunen, 'The Principles of Science' by William S. Jevons and 'Rationality in Action' by John Searle

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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