Combining Texts

You have chosen 'Of Civil Liberty' by David Hume, 'Principia Mathematica' by B Russell/AN Whitehead and 'On the Introduction of Transfinite Numbers' by John von Neumann

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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