Combining Texts

You have chosen 'Against Structural Universals' by David Lewis, 'On boundary numbers and domains of sets' by Ernst Zermelo and 'The Right and the Good' by W. David Ross

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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