Combining Texts

You have chosen 'On the Foundations of Logic and Arithmetic' by David Hilbert, 'Specimen inventorum' by Gottfried Leibniz and 'Fourfold Root of Princ of Sufficient Reason' by Arthur Schopenhauer

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All the ideas for Modes of Existence, or select a subheading:
      A. Relations
      B. Properties
      C. Powers and Dispositions
      D. Universals
      E. Nominalism