Combining Texts

You have chosen 'Counterpart theory and Quant. Modal Logic' by David Lewis, 'How free does the will need to be?' by Bernard Williams and 'Of Liberty and Necessity' by Thomas Hobbes

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All the ideas for Existence, or select a subheading:
      A. Nature of Existence
      B. Change in Existence
      C. Structure of Existence
      D. Theories of Reality
      E. Categories