Combining Texts

You have chosen 'What are Sets and What are they For?' by Oliver,A/Smiley,T, 'Political Ideals' by Bertrand Russell and 'Elbow Room: varieties of free will' by Daniel C. Dennett

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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