Combining Texts

You have chosen 'The Evolution of Logic' by William D. Hart, 'Counting and the Natural Numbers' by Jeffrey H. Sicha and 'How to Define Theoretical Terms' by David Lewis

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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