Combining Texts

You have chosen 'The World as Will and Idea' by Arthur Schopenhauer, 'The Search After Truth' by Nicolas Malebranche and 'The Nature of Mathematical Knowledge' by Philip Kitcher

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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