Combining Texts

You have chosen 'Science and Method' by Henri Poincaré, 'The Individual, the State, and the Common Good' by John Haldane and 'Causal and Metaphysical Necessity' by Sydney Shoemaker

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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