Combining Texts

You have chosen 'The Big Book of Concepts' by Gregory L. Murphy, 'Review of Chihara 'Struct. Accnt of Maths'' by John P. Burgess and 'works' by Thoralf Skolem

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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