Combining Texts

You have chosen 'The Actual and the Possible' by Alexander R. Pruss, 'Letter to Bramhall' by Thomas Hobbes and 'The Aim and Structure of Physical Theory' by Pierre Duhem

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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