Combining Texts

You have chosen 'Introduction to the Theory of Logic' by José L. Zalabardo, 'Science and Method' by Henri Poincar and 'Art and Its Objects' by Richard Wollheim

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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