Combining Texts

You have chosen 'On Body and Force, Against the Cartesians' by Gottfried Leibniz, 'Modal Logic' by Max J. Cresswell and 'The Aim and Structure of Physical Theory' by Pierre Duhem

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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