Combining Texts

You have chosen 'The Universe as We Find It' by John Heil, 'What We Owe to Each Other' by Thomas M. Scanlon and 'On the Concept of Number' by David Hilbert

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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