Combining Texts

You have chosen 'The Facts of Causation' by D.H. Mellor, 'Mathematical logic and theory of types' by Bertrand Russell and 'Pref to new 'Materialist Theory'' by David M. Armstrong

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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