Combining Texts

You have chosen 'Counterfactual Dependence and Time's Arrow' by David Lewis, 'Dialogue on human freedom and origin of evil' by Gottfried Leibniz and 'The Foundations of Mathematics (2nd ed)' by Kenneth Kunen

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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