Combining Texts

You have chosen 'Expositio super viii libros' by William of Ockham, 'The General Theory of Employment' by Maynard Keynes and 'The Laws of Thought' by George Boole

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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