Combining Texts

You have chosen 'On the Philosophy of Logic' by Jennifer Fisher, 'Elements of Set Theory' by Herbert B. Enderton 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