Combining Texts

You have chosen 'Evil and Omnipotence' by J.L. Mackie, 'Mathematical Thought from Ancient to Modern Times' by Morris Kline and 'The Concept of Mind' by Gilbert Ryle

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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