Combining Texts

You have chosen 'Walking the Tightrope of Reason' by Robert Fogelin, 'Reply to 'Rorarius' 2nd ed' by Gottfried Leibniz and 'Launching Points to the Realm of the Mind' by Porphyry

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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