Combining Texts

You have chosen 'Counterpart theory and Quant. Modal Logic' by David Lewis, 'The Foundations of Mathematics (2nd ed)' by Kenneth Kunen and 'Remarks on the forces of inorganic Nature' by J.R. Mayer

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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