Combining Texts

You have chosen 'The Evolution of Logic' by William D. Hart, 'The Actual and the Possible' by Alexander R. Pruss and 'An Analysis of Knowledge and Valuation' by C.I. Lewis

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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