Combining Texts

You have chosen 'The Value of Science' by Henri Poincaré, 'Lectures on the Principles of Political Obligation' by T.H. Green and 'Intro to 'Provenance of Pure Reason'' by William W. Tait

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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