Combining Texts

You have chosen 'works (fragments)' by Zeno (Citium), 'The Parts of Animals' by Aristotle and 'Elements of Set Theory' by Herbert B. Enderton

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All the ideas for Existence, or select a subheading:
      A. Nature of Existence
      B. Change in Existence
      C. Structure of Existence
      D. Theories of Reality
      E. Categories