Combining Texts

You have chosen 'A Short History of Ethics' by Alasdair MacIntyre, 'Symbolic Logic (with Langford)' by C.I. Lewis and 'Principles of Arithmetic, by a new method' by Giuseppe Peano

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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