Combining Texts

You have chosen 'Mind and Its Place in Nature' by C.D. Broad, 'An Axiomatization of Set Theory' by John von Neumann and 'Reply to 'Rorarius' 2nd ed' 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