Combining Texts

You have chosen 'From an Ontological Point of View' by John Heil, 'A Tour through Mathematical Logic' by Robert S. Wolf and 'Principle of Life and Plastic Natures' by Gottfried Leibniz

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All the ideas for Thought, or select a subheading:
      A. Modes of Thought
      B. Mechanics of Thought
      C. Content
      D. Concepts
      E. Abstraction