Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Geometrical Method and Metaphysics' by Gottfried Leibniz and 'Elimination of Metaphysics by Analysis of Language' by Rudolph Carnap

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All the ideas for Objects, or select a subheading:
      A. Existence of Objects
      B. Unity of Objects
      C. Structure of Objects
      D. Essence of Objects
      E. Objects over Time
      F. Identity among Objects