Combining Texts

You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'The Architecture of Mathematics' by Nicholas Bourbaki and 'New system of communication of substances' by Gottfried Leibniz

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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