Combining Texts

You have chosen 'Natural Goodness' by Philippa Foot, 'Of Organum or Ars Magna of Thinking' by Gottfried Leibniz and 'On the Source of Necessity' by Ross P. Cameron

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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