Combining Texts

You have chosen 'From an Ontological Point of View' by John Heil, 'Reply to 'Rorarius' 2nd ed' by Gottfried Leibniz and 'Introduction of 'Essence of Christianity'' by Ludwig Feuerbach

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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