Combining Texts

You have chosen 'On the Plurality of Worlds' by David Lewis, 'What is Justified Belief?' by Alvin I. Goldman and 'Introducing the Philosophy of Mathematics' by Michle Friend

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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