Combining Texts

You have chosen 'Intro to Positive Philosophy' by Auguste Comte, 'Political Philosophy (3rd ed)' by Adam Swift and 'On the Nature of Mathematical Reasoning' by Henri Poincar

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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