Combining Texts

You have chosen 'No Understanding without Explanation' by Michael Strevens, 'Some Puzzles of Ground' by Kit Fine and 'Boole calculus and the Concept script' by Gottlob Frege

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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