Combining Texts

You have chosen 'Intro to Positive Philosophy' by Auguste Comte, 'Philosophy and the Nature of Language' by David E. Cooper and 'On the Basis of Morality' by Arthur Schopenhauer

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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