Combining Texts

You have chosen 'The Evolution of Logic' by William D. Hart, 'Letters to Blijenburgh' by Baruch de Spinoza and 'Aristotle's Theory of Substance' by Michael V. Wedin

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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