Combining Texts

You have chosen 'Survival and Identity, with postscript' by David Lewis, 'An Axiomatization of Set Theory' by John von Neumann and 'Mathematics without Numbers' by Geoffrey Hellman

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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