Combining Texts

You have chosen 'The Origin of the Species' by Charles Darwin, 'Writing the Book of the World' by Theodore Sider and 'Dialogue on Things and Words' 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