Combining Texts

You have chosen 'On the Happy Life' by Seneca the Younger, 'The Foundations of Mathematics (2nd ed)' by Kenneth Kunen and 'Conjectures and Refutations' by Karl Popper

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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