Combining Texts

You have chosen 'Causal Powers' by Harré,R./Madden,E.H, 'What Does It Take to Refer?' by Kent Bach and 'Logicism and Ontological Commits. of Arithmetic' by Harold Hodes

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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