Combining Texts

You have chosen 'A Dictionary of Political Thought' by Roger Scruton, 'A World of Propensities' by Karl Popper and 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz

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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