Combining Texts

You have chosen 'Taking Rights Seriously' by Ronald Dworkin, 'Regressive Method for Premises in Mathematics' by Bertrand Russell 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