Combining Texts

You have chosen 'On Carnap's Views on Ontology' by Willard Quine, 'Two Chief World Systems' by Galileo Galilei and 'Writing the Book of the World' by Theodore Sider

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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