Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Title, Unity, Authenticity of the 'Categories'' by Michael Frede and 'Realistic Rationalism' by Jerrold J. Katz

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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