Combining Texts

You have chosen 'Actualism and Possible Worlds' by Alvin Plantinga, 'Counterpart theory and Quant. Modal Logic' by David Lewis and 'Believing the Axioms I' by Penelope Maddy

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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