Combining Texts

You have chosen 'From an Ontological Point of View' by John Heil, 'Four Decades of Scientific Explanation' by Wesley Salmon and 'Intro to 2nd ed of Principia Mathematica' by Bertrand Russell

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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