Combining Texts

You have chosen 'Ethics: Inventing Right and Wrong' by J.L. Mackie, 'Essays on Active Powers 4: Liberty of Agents' by Thomas Reid and 'Paradoxes: Form and Predication' by James Cargile

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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