Combining Texts

You have chosen 'Philosophical Essay on Probability' by Pierre Simon de Laplace, 'Summa Contra Gentiles' by Thomas Aquinas and 'Causation and the Manifestation of Powers' by Alexander Bird

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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