Combining Texts

You have chosen 'The Value of Science' by Henri Poincaré, 'Nature and Meaning of Numbers' by Richard Dedekind and 'What do powers do when they are not manifested?' by Stathis Psillos

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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