Combining Texts

You have chosen 'The Value of Science' by Henri Poincaré, 'Review of Tait 'Provenance of Pure Reason'' by Charles Parsons and 'The Concept of Logical Consequence' by John Etchemendy

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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